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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