[meteorite-list] Questions (chondrules and minerals)

From: Ingo Herkstroeter <metopaster_at_meteoritecentral.com>
Date: Mon, 21 May 2007 14:41:15 +0200
Message-ID: <000001c79ba5$530c90b0$0873a8c0_at_Geobase>

Hi Piper and List!
 
I have heard that schreibersite was also found in terrestrial irons from
Ovifak / Greenland! Is that true?
 
Ingo
 
-----Urspr?ngliche Nachricht-----
Von: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] Im Auftrag von
Piper R.W. Hollier
Gesendet: Freitag, 18. Mai 2007 10:57
An: meteorite-list at meteoritecentral.com
Betreff: Re: [meteorite-list] Questions (chondrules and minerals)
 
Hi Greg, Mike, Sterling, and list,

At 21:48 17/05/07, Greg wrote:



1. Has any rock formed on Earth been found containing Chondrules
in it? If so, what kind of rock and where was it found?

Sterling has a fascinating ability to describe complex processes lucidly
and accurately in layman's terms, so I have nothing to add to his
wonderful explanation except to recommend three good books that describe
in some detail the "geologic processing" that has turned the chondritic
precursors of terrestrial materials into the rocks and minerals that we
find today on Earth:
  Harry J. McSween, Stardust to Planets, St. Martin's Press, 1993, ISBN
0-312-09394-2
  Harry J. McSween, Meteorites and Their Parent Planets, Cambridge
University Press, 1987, ISBN 0-521-32431-9
  Robert T. Dodd, Thunderstones and Shooting Stars, Harvard University
Press, 1986, ISBN 0-674-89137-6



2. Are there any minerals found in Meteorites that are NOT found
(or formed) on earth.

Of the one hundred or so minerals found in meteorites, about twenty-five
are found only in meteorites. Here are some of them; someone who is more
of a mineralogist than I am can hopefully add to this list:

chromite: pure chromite, Fe(2+)Cr2O4, has been found only in meteorites.
Chromite has the general formula (Mg,Fe2+)(Cr,Al,Fe3+)2O4
http://www.answers.com/topic/chromite

clinoferrosillite: FeSi2O6, a high temperature polymorph of ferrosillite
found only in meteorites
http://www.minerals.net/mineral/silicate/ino/pyroxene/enstatit/ferrosil.
htm

djerfisherite: K3CuFe12S14
http://www.answers.com/topic/djerfisherite

kamacite: nickel-iron (low nickel), body-centered cubic alpha-Fe,Ni, a
nickel-iron alloy with up to 7.5 percent nickel
http://www.amonline.net.au/geoscience/meteors/types.htm
http://www.lpl.arizona.edu/~ingrid/dictionary.html

merrillite: Ca3(PO4)2, colorless phosphate mineral found only in
meteorites
http://www.answers.com/topic/merrillite

nierite: silicon nitride, Si3N4
http://adsabs.harvard.edu/abs/1995Metic..30..387L

niningerite: (Mg,Fe,Mn)S, mineral found only in meteorites
http://www.answers.com/topic/niningerite

osbornite: titanium nitride, TiN
http://www.galleries.com/minerals/elements/osbornit/osbornit.htm

rhabdite: synonym for schreibersite (see below)

schreibersite: iron-nickel-cobalt phosphide, (Fe, Ni, Co)3P
http://www.amonline.net.au/geoscience/meteors/types.htm

silicon carbide, SiC
http://gsa.confex.com/gsa/2004AM/finalprogram/abstract_78326.htm

taenite: nickel-iron (high nickel), face-centered cubic alpha-Fe,Ni with
varying Ni content (~ 27% to 65%)
http://www.amonline.net.au/geoscience/meteors/types.htm
http://www.lpl.arizona.edu/~ingrid/dictionary.html

ureyite: a sodium chromium pyroxene, NaCrSi2O6, found as rare emerald
green grains in the iron meteorites Coahuila, Toluca, and Hex River
Mountains
http://www.sciencemag.org/cgi/content/abstract/149/3685/742

One could make a second list of minerals that are very common in
meteorites and very rare on Earth (for example: troilite, FeS) .

Best wishes,

Piper


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