[meteorite-list] RE: Lodranites in stony-iron ???
Hi Pierre, They (the NIPR) are obviously holding on to an older classification scheme. The lodranites were originally grouped with the stony-irons before their close relationship to the acapulcoites and the PACs were revealed through modern research (such as O-isotopic studies, etc.). The siderophyres do represent a somewhat anachronistic class of meteorites that consisted of just one single member, Steinbach. Today, Steinbach is grouped with the IVA iron meteorites, and it is considered as an anomalous silicated member of this group. Nevertheless, it's tempting to compare Steinbach with the pallasites, and to consider it as a true stony-iron ;-) I hope this helps. Best, Norbert -Ursprüngliche Nachricht- Hello to the List, I'm reading a document published by the NIPR (Antarctic meteorites japanese research center) and I'm surprised to look at their classification page. Lodranites and Siderophyres (?) are considered as stony-iron meteorites. Can someone tell me what are Siderophyres and why are the Lodranites in stony-irons (I always thought they were achondrites) ? Best regards, Pierre-Marie PELE www.meteor-center.com __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] RE: Lodranites in stony-iron ???
Hello Confrère Pierre, Norbert, and List, MASON B. (1962) Meteorites, p. 125: The single siderophyre is the Steinbach meteorite (also known as Breitenbach or Rittersgrün), which has been known since 1724. It consists of a network of nickel-iron which encloses granular aggregates of orhopyroxene and minor tridymite, the nickel-iron and silicate being present in approximately equal amounts. Accessory minerals are schreibersite (in the nickel-iron), chromite, and troilite. The nickel-iron contains about 10% Ni and shows the Widman- stätten structure. The orthopyroxene contains about 20 mole per cent FeSiO3, and is therefore on the boundary between bronzite and hypersthene. BTW: A siderite used to be a meteorite consisting almost entirely of metallic minerals - sideros being the Greek word for iron. The syllable phyre usually says something contains coarse crystals, as phenocrysts, in a finer- grained groundmass. Best Perseid wishes, Bernd __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] RE: Lodranites in stony-iron ??? - Steinbach pictures
Bernd quoted: MASON B. (1962) Meteorites, p. 125: The single siderophyre is the Steinbach meteorite (also known as Breitenbach or Rittersgrün), which has been known since 1724. It consists of a network of nickel-iron which encloses granular aggregates of orhopyroxene and minor tridymite, the nickel-iron and silicate being present in approximately equal. snip Hi Bernd, Pierre, and All, For those of you who prefer something visual, here are some photos of a 4.1g Steinbach slice that resides in my collection since some years now: http://www.timewarp.de/list/Steinbach01.jpg http://www.timewarp.de/list/Steinbach02.jpg http://www.timewarp.de/list/Steinbach03.jpg The last picture shows a collection number painted on one edge of the specimen. Does anyone of you know of similar numbers? Any idea as to the original collection? The number is ST0041, the ST possibly standing for Steinbach? Any help would be very much appreciated. Thanks. All the best, Norbert __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] RE: Lodranites in stony-iron ??? - Steinbach pictures
My guess is a private collection and the number is not a catalogue number but its weight. 4.1 grams. Cheers, tett - Original Message - From: Norbert Classen [EMAIL PROTECTED] To: Meteorite-list@meteoritecentral.com Sent: Friday, August 12, 2005 5:24 PM Subject: [meteorite-list] RE: Lodranites in stony-iron ??? - Steinbach pictures Bernd quoted: MASON B. (1962) Meteorites, p. 125: The single siderophyre is the Steinbach meteorite (also known as Breitenbach or Rittersgrün), which has been known since 1724. It consists of a network of nickel-iron which encloses granular aggregates of orhopyroxene and minor tridymite, the nickel-iron and silicate being present in approximately equal. snip Hi Bernd, Pierre, and All, For those of you who prefer something visual, here are some photos of a 4.1g Steinbach slice that resides in my collection since some years now: http://www.timewarp.de/list/Steinbach01.jpg http://www.timewarp.de/list/Steinbach02.jpg http://www.timewarp.de/list/Steinbach03.jpg The last picture shows a collection number painted on one edge of the specimen. Does anyone of you know of similar numbers? Any idea as to the original collection? The number is ST0041, the ST possibly standing for Steinbach? Any help would be very much appreciated. Thanks. All the best, Norbert __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
