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i will be gradually switching over to yahoo mail (it has 100 FREE megs of storage). please cc to: [EMAIL PROTECTED]
>From: "MARK BOSTICK" <[EMAIL PROTECTED]> >To: [EMAIL PROTECTED], meteorite-list@meteoritecentral.com >Subject: RE: [meteorite-list] allende minerals?! >Date: Mon, 28 Mar 2005 10:19:35 -0600 > >Harlan asked, "just exactly what IS allende made of?" > >From: Smithsonian Contributions to the Earth Sciences >SCES-5, The Allende, Mexico, Meteorite Shower > >Roy S. Clarke, Jr., Eugene Jarosewich, Brian Mason, Joseph Nelen, >Manuel Gomez and Jack R. Hyde >Issue Date: February 17, 1971 > > >"Chemical and mineralogical compositions establish that Allende is a >Type III carbonaceous chondrite. Three distinct components can be >recognized: finegrained
black matrix (~60%), chondrules (~30%), and >irregular white aggregates (~10%). The matrix consists almost >entirely of iron-rich olivine (average 50% Fe2SiO4), with minor >amounts of troilite, pentlandite, and taenite, rendered opaque by >dispersed carbonaceous material. Most of the chondrules are >magnesium-rich, and consist of olivine (average 9% Fe2SiO4) with >minor amounts of clinoenstatite and some glass; a few chondrules are >rich in calcium and aluminum, and are made up largely of anorthite, >gehlenite, augite, and spinel. The irregular aggregates are also >rich in calcium and aluminum, and contain anorthite, gehlenite, >augite, spinel, nepheline, grossular, and sodalite (the last two >minerals have not previously been recorded from meteorites). >Complete chemical analyses have been made of the bulk meteorite, a >dark inclusion, the matrix,
a chondrule concentrate, two individual >chondrules, and a single aggregate." > > >Clear Skies, >Mark Bostick >Wichita, Kansas >www.meteoritearticles.com >www.kansasmeteoritesociety.com >www.imca.cc > ><< text2.html >> ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
