[meteorite-list] purple inclusion in Pete's meteorite
From: Mark Langenfeld <mlangen_at_meteoritecentral.com>
Date: Mon Oct 10 12:22:20 2005 Message-ID: <200510101622.j9AGMICp092748_at_mail2.mx.voyager.net> Hey, hey. Not to toot my own horn, but I'll take the cigar! Mark > Howdy, all > > I just finished a quick Raman analysis of Pete's meteorite, the one > with the purple inclusion in a sulfide. The short version - it's an > oxide weathering rind in a void in the sulfide. I don't recall who > raised that possibility, but you win the cigar. > > The long version is that the sulfide appears to be pentlandite or at > least fairly nickel-rich for troilite. The Raman spectrum is fairly > odd, but that probably has to do with the very little information > available on Raman spectra of sulfides rather than anything truly > bizarre about the sample. Examination under a light microscope shows > that the purple bit isn't an inclusion at all but an optical illusion > of one - it's a void space in the sulfide that is coated on all > surfaces with the reflective purple coating. A Raman spectrum shows > that it contains the sulfide along with both hematite and magnetite. > In other words, the sulfide is in the initial stages of rusting. > > Shiny. > > Cheers, > MDF > > Marc Fries > Postdoctoral Research Associate > Carnegie Institution of Washington > Geophysical Laboratory > 5251 Broad Branch Rd. NW > Washington, DC 20015 > PH: 202 478 7970 > FAX: 202 478 8901 > ----- > I urge you to show your support to American servicemen and servicewomen > currently serving in harm's way by donating items they personally request > at: > http://www.anysoldier.com > (This is not an endorsement by the Geophysical Laboratory or the Carnegie > Institution.) > ______________________________________________ > Meteorite-list mailing list > Meteorite-list_at_meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > -- CoreComm Webmail. http://home.core.comReceived on Mon 10 Oct 2005 12:22:17 PM PDT |
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