Re: [meteorite-list] triolite inclusions

[MexicoDoug]

edI don't think anyone has  
actually watch this happen so I'm pretty satisfied with these ideas but  very 
open 
as well to new ones:)
Saludos, Doug
 
 
 

En un mensaje con fecha 01/03/2005 11:55:07 AM Mexico Standard Time,  
[EMAIL PROTECTED] escribe:
Hi all,

A quick question regarding  rounded troilite inclusions in iron meteorites...

I believe FeS has a  significantly lower melting temperature (around 1000 
degrees C) than the  Fe-Ni alloy (around 1450 degrees C) that make most iron 
meteorites. In a  cooling planetismal, wouldn't one expect that troilite 
would be the last  dregs of molten liquid remaining in the cracks between 
crystallized Fe-Ni?  If that were the case, wouldn't troilite be expected to 
be a 'filler', with  an elongated morphology? So, why does troilite occur in 
rounded  inclusions?

Perhaps rounding from grain boundary diffusion occurs on a  long time-scale 
or the blebs are an indication of late stage impact melting  and rapid 
cooling... I'm not sure that I buy the surface tension idea where  troilite 
separates out from an ocean of liquid Fe-Ni  alloy.

Thanks,
John

From: [EMAIL PROTECTED]
To:  [EMAIL PROTECTED], meteorite-list@meteoritecentral.com
Subject: Re:  [meteorite-list] triolite inclusions
Date: Mon, 3 Jan 2005 11:51:26  EST


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Re: [meteorite-list] triolite inclusions

[John Keefner]

Hi all,
A quick question regarding rounded troilite inclusions in iron meteorites...
I believe FeS has a significantly lower melting temperature (around 1000 
degrees C) than the Fe-Ni alloy (around 1450 degrees C) that make most iron 
meteorites. In a cooling planetismal, wouldn't one expect that troilite 
would be the last dregs of molten liquid remaining in the cracks between 
crystallized Fe-Ni? If that were the case, wouldn't troilite be expected to 
be a 'filler', with an elongated morphology? So, why does troilite occur in 
rounded inclusions?

Perhaps rounding from grain boundary diffusion occurs on a long time-scale 
or the blebs are an indication of late stage impact melting and rapid 
cooling... I'm not sure that I buy the surface tension idea where troilite 
separates out from an ocean of liquid Fe-Ni alloy.

Thanks,
John
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED], meteorite-list@meteoritecentral.com
Subject: Re: [meteorite-list] triolite inclusions
Date: Mon, 3 Jan 2005 11:51:26 EST
Hola Steve,
I think Tri-o-lite is a dead brand of the dead Urelite Corporation.
On the other hand, Troilite, named for the Italian Jesuita Abbé Domenico
Troili of Villa Albareto meteorite fame.   The 1766 Italian  witnessed fall,
Troili collected eyewitness accounts of what he actually  believed was a 
volcanic
discharge into the atmosphere. Troilite was named after him since he
collected some of the stones - yes it was  first observed in "modern" times 
from
the University of Modena, Ferrari town,  Italy, in this L5 stone meteorite.
EvNot an iron meteorite.   Troilite's account led it to be understood as 
pyrite
(fool's gold), but a few  decades later Howard of Howardite fame set the 
woirld
straight on thatshowing it  was an iron sulfide but different from the
earthly ones because it was  NON-magnetic, unlike the earthly counterparts.  
Anyway
in 1863 Troili got  the honor and it was named "Troilit" by Rose in Berlin
after he  demonstrated that it was balanced FeS and recognized Troili's 
attempt
at  description of it nearly one hundred years earlier.   In English,  
Troilit
would be Troilite...

So...Troilite is just a charged balanced Fe-S hexoganol pyrrhotite, in  
other
words, ferrous sulfide.  Why it gets into the iron meteorites to me  is a
question with philosophical overtones like why is the sky blue.  The  stuff 
is
found in many mines as pyrrhotite, the similar earthly mineral which  almost
always has an excess of sulfur with it.  In other words, FeS iron  
defficient
where both have a plus two valence shell.  But if you look at it  another 
way,
considering the interior of planetesimals iron meteorite foundries,  you 
might
say the creator accidentally contaminated the iron with sulphur.   That is 
why
if you grind the mineral your pet blobs can stink on ice like  rotten eggs.

Sulfur isn't the only contaminant in the meteoritical material.  There  is a
host of stuff like Iriduim in traces, too.  Or oxygen in carbonaceous
meteorites.  So where you get a nice oxide with oxygen, you might get a  
nice sulfide
with sulfur.  Putting the sulfur in the foundry and then  getting the
blobules you like might be caused by physical events internal in the  
meteoritical
foundary.  Perhaps when all is molten to start with, the iron  nickel form a
nice alloy not too miscible with the troilite, so they naturally  separate, 
just
like you shaking up a bottle with oil and water and watching the  blobs form
of the separate phases (aquaeous and organic).  Or perhaps the  high
pressuressquish it into imperfections in the iron nickel alloy as it cools,  
like
squashing a Miller can in your hands, maybe it sort of aggregates  through 
the
conduits that are available.  But that really isn't likely in  my opinion as 
the
first, because they are usually rounded or spheroidal  indicating more of a
miscibility (mix-separation) issue.  A sphere like  shape is formed because 
it
minimizes the surface exposed for a given volume when  stuck in an 
unfriendly
environment.  That's why babies are in the fetal  position and girlfriends 
too,
when they are left cold and alone.:)  And  raindrops look that way and maybe
tektites sort of, too...

Troilite by no means is limited to occur in iron meteorites, so the creator
has contaminated stoney meteorites with it too, as was first observed
meticulously by Troili.and there is some in the samples of lunar soil 
brought  back
from the Apollo missions as well.

Hope this helps your thirst for knowledgof the rockin our  showcases
Saludos and thanks for the Christmas present "freebee",  Doug
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Re: [meteorite-list] triolite inclusions

[Norman Lehrman]

Karin, Tom, Steve & list--

Norton doesn't answer the Troilite question anywhere
that I can see.  He simply provides descriptive
comments.  I don't have the answer, but I've wondered
about the same question: why does troilite commonly
assume the form of rounded blobs?

A speculation based on my exposure to terrestrial
materials is that it may involve immiscibility in the
original melt, analogous to oil in water.  We
sometimes see rounded inclusions of sulfide minerals
in silicate melts.  In igneous materials, rounded
phase boundaries typically mean that the shape was
generated by surface tension, which would only be
influential in the molten state.  I don't know that
sulfides are immiscible in Fe-Ni melts, but that's
what it looks like.

I'm sure someone out there has the real answers rather
than speculations, but I thought I'd throw these ideas
out to keep the ball rolling---

Happy new orbit to all!
Norm
(http://TektiteSource.com)

--- Tom AKA James Knudson
<[EMAIL PROTECTED]> wrote:

> Steve might be like me, poor guy! Even as great as
> rocks from space is, it
> goes right over my head! I've read the thing over
> and over, and I still
> don't get it all. I do so much better if I here it
> from someone on the list,
> explained in plain old English with out the tech
> stuff.
> 
> Thanks, Tom
> peregrineflier <><
> IMCA 6168
>
http://www.frontiernet.net/~peregrineflier/Peregrineflier.htm
> - Original Message -
> From: "Karin Hughes" <[EMAIL PROTECTED]>
> To: 
> Sent: Monday, January 03, 2005 9:04 AM
> Subject: RE: [meteorite-list] triolite inclusions
> 
> 
> > Steve.
> >
> > Do you own the book "Rocks from Space" by O.
> Richard Norton?   If not, why
> > not?
> >
> > As someone who only recently became interested in
> meteorites, I have found
> > this book contains a wealth of knowledge.  You may
> want to take a look at
> > someone's copy.
> >
> > Karin
> >
> >
> > >From: "Steve Arnold, Chicago!!!"
> <[EMAIL PROTECTED]>
> > >To: meteorite-list@meteoritecentral.com
> > >Subject: [meteorite-list] triolite inclusions
> > >Date: Mon, 3 Jan 2005 07:26:27 -0800 (PST)
> > >
> > >Hello and good morning list.I need a question
> answerd.One thing I am
> going
> > >to do this year, is make a habit to get to know a
> little more about the
> > >scientific end of our great hobby.I need to know
> what causes triolite
> > >inclusions into iron meteorites?What causes the
> triolte to get into the
> > >veins to make those great looking blobs to
> occur.Email at your
> convience.I
> > >am off all day.
> > >
> > >
> > >steve arnold,
> chicago, usa!!
> > >
> > >=
> > >Steve R.Arnold, Chicago, IL, 60120
> > >I. M. C. A. MEMBER #6728
> > >Illinois Meteorites
> > >website url http://stormbringer60120.tripod.com
> >
> >http://members.ebay.com/aboutme/illinoismeteorites/
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >__
> > >Do you Yahoo!?
> > >Yahoo! Mail - You care about security. So do we.
> > >http://promotions.yahoo.com/new_mail
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> >
>
>http://six.pairlist.net/mailman/listinfo/meteorite-list
> >
> >
>
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Re: [meteorite-list] triolite inclusions

[MexicoDoug]

Hola Steve,
 
I think Tri-o-lite is a dead brand of the dead Urelite Corporation.
 
On the other hand, Troilite, named for the Italian Jesuita Abbé Domenico  
Troili of Villa Albareto meteorite fame.   The 1766 Italian  witnessed fall, 
Troili collected eyewitness accounts of what he actually  believed was a 
volcanic 
discharge into the atmosphere. Troilite was named after him since he 
collected some of the stones - yes it was  first observed in "modern" times 
from 
the University of Modena, Ferrari town,  Italy, in this L5 stone meteorite.  
EvNot an iron meteorite.   Troilite's account led it to be understood as pyrite 
(fool's gold), but a few  decades later Howard of Howardite fame set the woirld 
straight on thatshowing it  was an iron sulfide but different from the 
earthly ones because it was  NON-magnetic, unlike the earthly counterparts.  
Anyway 
in 1863 Troili got  the honor and it was named "Troilit" by Rose in Berlin 
after he  demonstrated that it was balanced FeS and recognized Troili's attempt 
at  description of it nearly one hundred years earlier.   In English,  Troilit 
would be Troilite...
 
So...Troilite is just a charged balanced Fe-S hexoganol pyrrhotite, in  other 
words, ferrous sulfide.  Why it gets into the iron meteorites to me  is a 
question with philosophical overtones like why is the sky blue.  The  stuff is 
found in many mines as pyrrhotite, the similar earthly mineral which  almost 
always has an excess of sulfur with it.  In other words, FeS iron  defficient 
where both have a plus two valence shell.  But if you look at it  another way, 
considering the interior of planetesimals iron meteorite foundries,  you might 
say the creator accidentally contaminated the iron with sulphur.   That is why 
if you grind the mineral your pet blobs can stink on ice like  rotten eggs.
 
Sulfur isn't the only contaminant in the meteoritical material.  There  is a 
host of stuff like Iriduim in traces, too.  Or oxygen in carbonaceous  
meteorites.  So where you get a nice oxide with oxygen, you might get a  nice 
sulfide 
with sulfur.  Putting the sulfur in the foundry and then  getting the 
blobules you like might be caused by physical events internal in the  
meteoritical 
foundary.  Perhaps when all is molten to start with, the iron  nickel form a 
nice alloy not too miscible with the troilite, so they naturally  separate, 
just 
like you shaking up a bottle with oil and water and watching the  blobs form 
of the separate phases (aquaeous and organic).  Or perhaps the  high 
pressuressquish it into imperfections in the iron nickel alloy as it cools,  
like 
squashing a Miller can in your hands, maybe it sort of aggregates  through the 
conduits that are available.  But that really isn't likely in  my opinion as 
the 
first, because they are usually rounded or spheroidal  indicating more of a 
miscibility (mix-separation) issue.  A sphere like  shape is formed because it 
minimizes the surface exposed for a given volume when  stuck in an unfriendly 
environment.  That's why babies are in the fetal  position and girlfriends too, 
when they are left cold and alone.:)  And  raindrops look that way and maybe 
tektites sort of, too...
 
Troilite by no means is limited to occur in iron meteorites, so the creator  
has contaminated stoney meteorites with it too, as was first observed  
meticulously by Troili.and there is some in the samples of lunar soil brought  
back 
from the Apollo missions as well.
 
Hope this helps your thirst for knowledgof the rockin our  showcases
Saludos and thanks for the Christmas present "freebee",  Doug
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Re: [meteorite-list] triolite inclusions

[Tom AKA James Knudson]

Steve might be like me, poor guy! Even as great as rocks from space is, it
goes right over my head! I've read the thing over and over, and I still
don't get it all. I do so much better if I here it from someone on the list,
explained in plain old English with out the tech stuff.

Thanks, Tom
peregrineflier <><
IMCA 6168
http://www.frontiernet.net/~peregrineflier/Peregrineflier.htm
- Original Message -
From: "Karin Hughes" <[EMAIL PROTECTED]>
To: 
Sent: Monday, January 03, 2005 9:04 AM
Subject: RE: [meteorite-list] triolite inclusions


> Steve.
>
> Do you own the book "Rocks from Space" by O. Richard Norton?   If not, why
> not?
>
> As someone who only recently became interested in meteorites, I have found
> this book contains a wealth of knowledge.  You may want to take a look at
> someone's copy.
>
> Karin
>
>
> >From: "Steve Arnold, Chicago!!!" <[EMAIL PROTECTED]>
> >To: meteorite-list@meteoritecentral.com
> >Subject: [meteorite-list] triolite inclusions
> >Date: Mon, 3 Jan 2005 07:26:27 -0800 (PST)
> >
> >Hello and good morning list.I need a question answerd.One thing I am
going
> >to do this year, is make a habit to get to know a little more about the
> >scientific end of our great hobby.I need to know what causes triolite
> >inclusions into iron meteorites?What causes the triolte to get into the
> >veins to make those great looking blobs to occur.Email at your
convience.I
> >am off all day.
> >
> >
> >steve arnold, chicago, usa!!
> >
> >=
> >Steve R.Arnold, Chicago, IL, 60120
> >I. M. C. A. MEMBER #6728
> >Illinois Meteorites
> >website url http://stormbringer60120.tripod.com
> >http://members.ebay.com/aboutme/illinoismeteorites/
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >__
> >Do you Yahoo!?
> >Yahoo! Mail - You care about security. So do we.
> >http://promotions.yahoo.com/new_mail
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>
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RE: [meteorite-list] triolite inclusions

[Karin Hughes]

Steve.
Do you own the book "Rocks from Space" by O. Richard Norton?   If not, why 
not?

As someone who only recently became interested in meteorites, I have found 
this book contains a wealth of knowledge.  You may want to take a look at 
someone's copy.

Karin

From: "Steve Arnold, Chicago!!!" <[EMAIL PROTECTED]>
To: meteorite-list@meteoritecentral.com
Subject: [meteorite-list] triolite inclusions
Date: Mon, 3 Jan 2005 07:26:27 -0800 (PST)
Hello and good morning list.I need a question answerd.One thing I am going
to do this year, is make a habit to get to know a little more about the
scientific end of our great hobby.I need to know what causes triolite
inclusions into iron meteorites?What causes the triolte to get into the
veins to make those great looking blobs to occur.Email at your convience.I
am off all day.
   steve arnold, chicago, usa!!
=
Steve R.Arnold, Chicago, IL, 60120
I. M. C. A. MEMBER #6728
Illinois Meteorites
website url http://stormbringer60120.tripod.com
http://members.ebay.com/aboutme/illinoismeteorites/





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Re: [meteorite-list] triolite inclusions

[Thomas Webb]

Hi Steve,
Do you mean troilite?  It's an iron sulfide much like
pyrrhotite but only found in meteorites. The iron
sulfide is formed from the iron in combination with
sulfur from sulfur containing minerals.  You will
probably get a more technical explanation from some of
the list members.  I'm sure they will know what you're
talking about but you might want to correct the
spelling.
My best,
Thomas

--- "Steve Arnold, Chicago!!!"
<[EMAIL PROTECTED]> wrote:

> Hello and good morning list.I need a question
> answerd.One thing I am going
> to do this year, is make a habit to get to know a
> little more about the
> scientific end of our great hobby.I need to know
> what causes triolite
> inclusions into iron meteorites?What causes the
> triolte to get into the
> veins to make those great looking blobs to
> occur.Email at your convience.I
> am off all day.
> 
> 
>steve arnold,
> chicago, usa!!
> 
> =
> Steve R.Arnold, Chicago, IL, 60120 
> I. M. C. A. MEMBER #6728 
> Illinois Meteorites 
> website url http://stormbringer60120.tripod.com
> http://members.ebay.com/aboutme/illinoismeteorites/
>  
>  
> 
> 
> 
> 
> 
> 
> 
> 
>   
>   
> __ 
> Do you Yahoo!? 
> Yahoo! Mail - You care about security. So do we. 
> http://promotions.yahoo.com/new_mail
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>
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[meteorite-list] triolite inclusions

[Steve Arnold, Chicago!!!]

Hello and good morning list.I need a question answerd.One thing I am going
to do this year, is make a habit to get to know a little more about the
scientific end of our great hobby.I need to know what causes triolite
inclusions into iron meteorites?What causes the triolte to get into the
veins to make those great looking blobs to occur.Email at your convience.I
am off all day.


   steve arnold, chicago, usa!!

=
Steve R.Arnold, Chicago, IL, 60120 
I. M. C. A. MEMBER #6728 
Illinois Meteorites 
website url http://stormbringer60120.tripod.com
http://members.ebay.com/aboutme/illinoismeteorites/
 
 










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Re: [meteorite-list] triolite inclusions

[rochette]

>Hello Pierre and list,
>
>Now I am really confused.  "Rocks From Space" both first and second edition
>list troilite as a magnetic iron sulfide.  

Wrong!  But it was common in the old days to misinterprete monoclinic pyrrhotite as troilite. Real pure troilite is less magnetic than olivine.

Though it is ignored in the
>general index of both it is listed in the glossaries.  In "The Cambridge
>Encyclopedia Of Meteorites" it is ignored in the index but is listed in
>Appendix C Minerals in Meteorites.  This entry states that it "is not
>magnetic".  I have a Gibeon slice with a large inclusion (2"x1.25") which I
>have always assumed to be troilite.  This inclusion is quite magnetic.
>

Well here it is probably really troilite but with numerous micro inclusions of metal (or even magnetite as in the graphite inclusions), thus accounting for the magnetism of  the bulk. XRD is a good way to check.

PS:how can you judge that the inclusion is magnetic by itself and not as a side effect if it is surrounded by metal

Pierre

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Re: [meteorite-list] triolite inclusions

[Dan Wray]

Hello Pierre and list,

Now I am really confused.  "Rocks From Space" both first and second edition
list troilite as a magnetic iron sulfide.  Though it is ignored in the
general index of both it is listed in the glossaries.  In "The Cambridge
Encyclopedia Of Meteorites" it is ignored in the index but is listed in
Appendix C Minerals in Meteorites.  This entry states that it "is not
magnetic".  I have a Gibeon slice with a large inclusion (2"x1.25") which I
have always assumed to be troilite.  This inclusion is quite magnetic.

Dan Wray
COMETS ( Colorado Meteorite Society)
- Original Message -
From: "rochette" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, January 28, 2003 7:07 AM
Subject: Re: [meteorite-list] triolite inclusions


> >Steve / Steve:
> >
> > >Isn't Pyrrhotite Fe(1-x)S?
> >
> >True.  Troilite is distinct from Pyrrhotite. It was simply the best
> >terrestrial analog, found in abundance on Earth and easily referenced,
> >that I could come up with at the time for S. Arnold's post.
> >
>
> to be more precise there are different sorts of pyrrhotite: a first one
> that is very like troilite (FeS): "non magnetic" (in fact
> antiferromagnetic) with formula Fe9S10 and hexagonal system, and the
second
> one (not mentionning extra and more exotic forms) Fe7S8 which is magnetic
> and monoclinic. The last one is more common in terrestrial rocks, but also
> present in SNC and Rumuritites (probably as a mixture with Fe9S10)
>
>
> Pierre
>
>
>
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Re: [meteorite-list] triolite inclusions

[rochette]

>Steve / Steve:
>
> >Isn't Pyrrhotite Fe(1-x)S?
>
>True.  Troilite is distinct from Pyrrhotite. It was simply the best
>terrestrial analog, found in abundance on Earth and easily referenced,
>that I could come up with at the time for S. Arnold's post.
>

to be more precise there are different sorts of pyrrhotite: a first one
that is very like troilite (FeS): "non magnetic" (in fact
antiferromagnetic) with formula Fe9S10 and hexagonal system, and the second
one (not mentionning extra and more exotic forms) Fe7S8 which is magnetic
and monoclinic. The last one is more common in terrestrial rocks, but also
present in SNC and Rumuritites (probably as a mixture with Fe9S10)


Pierre



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Re: [meteorite-list] triolite inclusions

[LabNEMS]

Steve / Steve:

>Isn't Pyrrhotite Fe(1-x)S?

True.  Troilite is distinct from Pyrrhotite. It was simply the best
terrestrial analog, found in abundance on Earth and easily referenced,
that I could come up with at the time for S. Arnold's post.

Russ K., NEMS
www.meteorlab.com

At 08:18 AM 01/28/2003 -0500, you wrote:

At 09:19 PM 1/27/2003 -0500, LabNEMS wrote:

Steve:

Troilite is FeS.  A terrestrial analog is the mineral Pyrrhotite Fe(1)S.

Any troilite "cavities" are probably what is referred to as "vugs" that
may (or may not) have contained troilite but went from a solid to a gas
from shock. Evidence of this would be in the mineralogy of the vug's lining.

Russ Kempton, NEMS
www.meteorlab.com




Isn't Pyrrhotite Fe(1-x)S?  I think it was in 1863 that troilite was shown 
to be distinct from pyrrhotite.  Troilite has been found in terrestrial 
settings, notably the serpentine of Del Norte County, Ca.; ultramafic 
inclusions in the Sally Malay deposit in Australia; as flecks in marble in 
Glenelg, Scotland; igneous deposits in China and in the Velfjord-Tosen 
region in Norway
as part of some metasediments.  (No I don't have all that on the tip of my 
tongue - my mineralogy professor made us write term papers on a mineral 
and I chose troilite.)

Steven

Steven Singletary
54-1224
Dept. Earth, Atmospheric and Planetary Sciences
M.I.T.
Cambridge, MA 02139
Tel - 617.253.6398
Fax - 617.253.7102


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Re: [meteorite-list] triolite inclusions

[S.Singletary]

At 09:19 PM 1/27/2003 -0500, LabNEMS wrote:

Steve:

Troilite is FeS.  A terrestrial analog is the mineral Pyrrhotite Fe(1)S.

Any troilite "cavities" are probably what is referred to as "vugs" that
may (or may not) have contained troilite but went from a solid to a gas
from shock. Evidence of this would be in the mineralogy of the vug's lining.

Russ Kempton, NEMS
www.meteorlab.com




Isn't Pyrrhotite Fe(1-x)S?  I think it was in 1863 that troilite was shown 
to be distinct from pyrrhotite.  Troilite has been found in terrestrial 
settings, notably the serpentine of Del Norte County, Ca.; ultramafic 
inclusions in the Sally Malay deposit in Australia; as flecks in marble in 
Glenelg, Scotland; igneous deposits in China and in the Velfjord-Tosen 
region in Norway
as part of some metasediments.  (No I don't have all that on the tip of my 
tongue - my mineralogy professor made us write term papers on a mineral and 
I chose troilite.)

Steven

Steven Singletary
54-1224
Dept. Earth, Atmospheric and Planetary Sciences
M.I.T.
Cambridge, MA 02139
Tel - 617.253.6398
Fax - 617.253.7102


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Re: [meteorite-list] triolite inclusions

[mark ferguson]

Hi Jeff, Steve and List
There is a great book (and offhand, I can't remember
the name of the author) but its called Opaque Minerals
in Meteorites and goes into detail on these minerals
which don't show up other than black blebs under
crossed polars.
Mark 
--- Jeff Kuyken <[EMAIL PROTECTED]> wrote:
> G'day Mike, Russ & List,
> 
> I have a small endcut of NWA 803 which has a few
> metal pockets and in the centre of those are other
> inclusions. It is not rust, but I always thought it
> was perhaps triolite. They are a gold/brown colour.
> Would this assumption be correct or way off track? I
> think I read somewhere that you can get triolite in
> metal pockets like these. You can see a photo of the
> piece at this address:
> 
>
http://www.meteoritesaustralia.com/features/nwa803.html
> 
> Thanks,
> 
> Jeff Kuyken
> I.M.C.A. #3085
> www.meteoritesaustralia.com
>   - Original Message - 
>   From: tett 
>   To: STEVE ARNOLD ;
> [EMAIL PROTECTED] 
>   Sent: Tuesday, January 28, 2003 11:43 AM
>   Subject: Re: [meteorite-list] triolite inclusions
> 
> 
>   Steve,
> 
>   Troilite is the mineral iron-sulphide.  I would
> guess that sulphur and iron mixed in sections of
> iron meteorites as the material was cooling and
> formed these pockets.  Perhaps someone more learned
> on the list could explain better.  Not much in
> R.F.S. or The Encylopedia or Met. & T. Parent
> Planets covering Troilite.  At least not that I
> could find in 5 minutes.
> 
>   A few web pages state that this mineral is only
> found in meteorites and other state that it is
> "predominantly" found in meteorites.  
> 
>   I have a nice Sikhote slice with troilite
> inclusions and it is now more dear to me since
> learning how rare this mineral is.  Thanks for
> bringing this up Steve.
> 
>   Cheers,
> 
>   Mike
> - Original Message - 
> From: STEVE ARNOLD 
> To: [EMAIL PROTECTED] 
> Sent: Monday, January 27, 2003 7:03 PM
> Subject: [meteorite-list] triolite inclusions
> 
> 
> Hey there good list. Can someone please let me
> know, what is triolite? And why does it tend to make
> cavitys in iron meteoritesPlease let me know.
> 
> 
> steve
> 
> 
> 
> 
> Steve   R.  Arnold, Chicago, USA!!
> 
> The Midwest Meteorite Collector!
> 
> I.M.C.A.   #6728
> 
> stormbringer60120.tripod.com
> 
> 
> 
> 
> 
>

> Do you Yahoo!?
> Yahoo! Mail Plus - Powerful. Affordable. Sign up
> now
> 


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Re: [meteorite-list] triolite inclusions

[Jeff Kuyken]

G'day Mike, Russ & List,
 
I have a small endcut of NWA 803 
which has a few metal pockets and in the centre of those are other 
inclusions. It is not rust, but I always thought it was perhaps triolite. They 
are a gold/brown colour. Would this assumption be correct or way off track? I 
think I read somewhere that you can get triolite in metal pockets like these. 
You can see a photo of the piece at this address:
 
http://www.meteoritesaustralia.com/features/nwa803.html
 
Thanks,
 
Jeff KuykenI.M.C.A. #3085www.meteoritesaustralia.com

  - Original Message - 
  From: 
  tett 
  To: STEVE ARNOLD ; [EMAIL PROTECTED] 
  
  Sent: Tuesday, January 28, 2003 11:43 
  AM
  Subject: Re: [meteorite-list] triolite 
  inclusions
  
  Steve,
   
  Troilite is the mineral iron-sulphide.  I 
  would guess that sulphur and iron mixed in sections of iron meteorites as 
  the material was cooling and formed these pockets.  Perhaps someone more 
  learned on the list could explain better.  Not much in R.F.S. or The 
  Encylopedia or Met. & T. Parent Planets covering Troilite.  At least 
  not that I could find in 5 minutes.
   
  A few web pages state that this mineral is only 
  found in meteorites and other state that it is "predominantly" found in 
  meteorites.  
   
  I have a nice Sikhote slice with troilite 
  inclusions and it is now more dear to me since learning how rare this mineral 
  is.  Thanks for bringing this up Steve.
   
  Cheers,
   
  Mike
  
- Original Message - 
From: 
STEVE ARNOLD 
To: [EMAIL PROTECTED] 

Sent: Monday, January 27, 2003 7:03 
PM
    Subject: [meteorite-list] triolite 
inclusions

Hey there good list. Can someone please let me know, what is triolite? 
And why does it tend to make cavitys in iron meteoritesPlease let me 
know.
 
steve
Steve   R.  Arnold, Chicago, 
USA!!
The Midwest Meteorite Collector!
I.M.C.A.   #6728
stormbringer60120.tripod.com


Do you Yahoo!?Yahoo! 
Mail Plus - Powerful. Affordable. Sign up 
now

Re: [meteorite-list] triolite inclusions

[David Freeman]

It is obvious you don't have your Rocks From Space Book yet.  O. Richard 
Norton may be at the Tucson even, get the book, signed if your nice to him.
It is the bible.  I couldn't feature owning not one meteorite with out it.
Happy 82 degrees in Tucson today,
Dave Freeman
Oh, triolite is carbon. It makes cavities because it is soft, or friable 
and burns/melts/erodes out.  Ablation is a good word here.
What is ablation?

STEVE ARNOLD wrote:

Hey there good list. Can someone please let me know, what is triolite? 
And why does it tend to make cavitys in iron meteoritesPlease let me know.

 
steve



Steve   R.  Arnold, Chicago, USA!!

The Midwest Meteorite Collector!

I.M.C.A.   #6728

stormbringer60120.tripod.com



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Re: [meteorite-list] triolite inclusions

[LabNEMS]

Steve:

Troilite is FeS.  A terrestrial analog is the mineral Pyrrhotite Fe(1)S.

Any troilite "cavities" are probably what is referred to as "vugs" that
may (or may not) have contained troilite but went from a solid to a gas
from shock. Evidence of this would be in the mineralogy of the vug's lining.

Russ Kempton, NEMS
www.meteorlab.com


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Re: [meteorite-list] triolite inclusions

[tett]

Steve,
 
Troilite is the mineral iron-sulphide.  I 
would guess that sulphur and iron mixed in sections of iron meteorites as 
the material was cooling and formed these pockets.  Perhaps someone more 
learned on the list could explain better.  Not much in R.F.S. or The 
Encylopedia or Met. & T. Parent Planets covering Troilite.  At least 
not that I could find in 5 minutes.
 
A few web pages state that this mineral is only 
found in meteorites and other state that it is "predominantly" found in 
meteorites.  
 
I have a nice Sikhote slice with troilite 
inclusions and it is now more dear to me since learning how rare this mineral 
is.  Thanks for bringing this up Steve.
 
Cheers,
 
Mike

  - Original Message - 
  From: 
  STEVE 
  ARNOLD 
  To: [EMAIL PROTECTED] 
  
  Sent: Monday, January 27, 2003 7:03 
  PM
  Subject: [meteorite-list] triolite 
  inclusions
  
  Hey there good list. Can someone please let me know, what is triolite? And 
  why does it tend to make cavitys in iron meteoritesPlease let me know.
   
  steve
  Steve   R.  Arnold, Chicago, 
  USA!!
  The Midwest Meteorite Collector!
  I.M.C.A.   #6728
  stormbringer60120.tripod.com
  
  
  Do you Yahoo!?Yahoo! Mail 
  Plus - Powerful. Affordable. Sign up 
  now

[meteorite-list] triolite inclusions

[STEVE ARNOLD]

Hey there good list. Can someone please let me know, what is triolite? And why does it tend to make cavitys in iron meteoritesPlease let me know.
 steveSteve   R.  Arnold, Chicago, USA!!
The Midwest Meteorite Collector!
I.M.C.A.   #6728
stormbringer60120.tripod.comDo you Yahoo!?
Yahoo! Mail Plus - Powerful. Affordable. Sign up now