Howard:
It was my undertsanding that these were only observed in thin section,
or using and SEM, in rare cases. You can see some of the caliche
(CaCO3) veins (terrestrial) in some of the large slices.
Here is a good summary paper of Dhofar 019
http://www-curator.jsc.nasa.gov/curator/antmet/mmc/XVII-%20Dhofar.PDF
This is a really nice and cheap martian meteorite. Several dealers on
this list have some.
Matt Morgan
Howard Wu wrote:
I wish to thank the those who took time to look for orangettes in there
large slices of Dhofar 019 and for whatever reason posted me privately.
(Perhaps you don't wish to let others know what big slices you have.)
For my part, my parttslice was only 0.19gm and I saw nothing (up to
x60.) After doing further reading, I understand indiviulal organettes
would be in the nanometter range. But I still hoped that collectively
that an area of orangettes might be visible. Calcite veining at least
should have been apparent on some larger slices.
Two observers didn't see the anything that may have been organette
related. Observation to 120x. However, one person did make the following
observations:
I looked under my scope for the orangettes and can see several areas
where tiny alteration specks are present. Look like they are 0.5 mm or
less in size. Some are located along fractures (one at an intersection)
but they don't seem common. Another fracture intersection has no
evidence of any alteration. Other alteration areas are present but don't
seem associated with fractures. A large areas one to two cm in diameter
seems to have no evidence of anything that might be an orangette. In
fact, most of the slice appears very fresh. However, in another
portion, orangish alteration products appear to be fairly common.
Comments, anyone?
Interesting excercise in amateur scientific verification. I will follow
up to any other contributions to this search among us
collectors. (Unless you wish to post directly to the list.) And next
time I get to Mono Lake I see what I can be seen on those tufas.
Howard Wu
Bishop, CA
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