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Graves Nunataks 95229
Basic information Name: Graves Nunataks 95229
     This is an OFFICIAL meteorite name.
Abbreviation: GRA 95229
Observed fall: No
Year found: 1995
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 128.9 g
Antarctic Meteorite Newsletter:  AMN 20(2)  (1997)  CR2
Meteoritical Bulletin:  MB 82  (1998)  CR2
NHM Catalogue:  5th Edition  (2000)  CR2
MetBase:  v. 7.1  (2006)  CR2
Recommended:  CR2    [explanation]

This is 1 of 188 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Writeup from AMN 20(2):
Sample No.:GRA95229
Location:Graves Nunatak
Dimensions (cm):5.0x3.0x3.5
Weight (g):128.9
Meteorite Type:CR2 Chondrite

Macroscopic Description: Kathleen McBride
The exterior has dull black fusion crust with polygonal fractures. The matrix is dark with numerous chondrules most of which have weathered to a yellowish color.

Thin Section (,2) Description: Brian Mason
The section shows a close packed aggregate of chondrules (up to 2 mm across) and chondrule fragments in a small amount of black matrix which contains about 10% nickel-iron (in part concentrated as rims to chondrules) and a little troilite. Chondrule types include granular olivine, olivine-pyroxene and barred olivine. Weathering is indicated by pervasive limonitic staining. Microprobe analyses show that most of the olivine is close to Mg2SiO4 in composition, with a few iron-rich grains; pyroxene composition is Fs2-4. The meteorite is tentatively clas-sified as a C2 chondrite of the Renazzo subtype, although the amount of matrix is unusually low.

GRA95229 TS - Plane Polarized LightGRA95229 TS - Cross Polarized Light
Plane-Polarized LightCross-Polarized Light
Data from:
  Table A1
  Line 130:
Origin or pseudonym:Lower West Graves
Mass (g):128.9
Weathering grade:A
Fayalite (mol%):1-31
Ferrosilite (mol%):2-4
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References: Published in Antarctic Meteorite Newsletter 20(2) (1997), JSC, Houston
Published in Meteoritical Bulletin, no. 82, MAPS 33, A221-A240 (1998)
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Photographs from AMN:
Photograph from unknown source A photo is in the write-up above

     Catalogue of Meteorites:   (86° 43'S, 141° 30'W)
     Recommended::   (86° 43'S, 141° 30'W)

     This is 1 of 44048 approved meteorites from Antarctica (plus 3802 unapproved names)
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