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Graves Nunataks 95205
Basic information Name: Graves Nunataks 95205
     This is an OFFICIAL meteorite name.
Abbreviation: GRA 95205
Observed fall: No
Year found: 1995
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1460 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 20(1)  (1997)  Ureilite
Meteoritical Bulletin:  MB 82  (1998)  Ureilite
NHM Catalogue:  5th Edition  (2000)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 495 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeuphelp
Writeup from AMN 20(1):
Sample No.: GRA95205
Location: Graves Nunataks
Dimensions (cm):10.5 x 7.5 x 7.5
Weight (g): 1459.8
Meteorite Type:Ureilite
gra95205

Macroscopic Description: Kathleen McBride
The exterior of this achondrite has patches of dull black fusion crust with polygonal fractures. Most of the fusion crust has weathered away. The resulting surface is a rusty green-brown color with numerous areas or patches of shiny melted-appearing minerals. Several fractures are visible. This meteorite is very hard and extremely difficult to break. The interior revealed white to yellow minerals; pyroxene and plagioclase and oxides are present. Some areas are completely rusty. Cleavage planes were visible on some of the larger mineral grains. This achondrite has an igneous texture.

Thin Section (,5) Description: Brian Mason
The section shows an aggregate of anhedral to subhedral grains, up to 6 mm across, of olivine and pyroxene. Individual grains are rimmed by carbonaceous material which contains trace amounts of nickel-iron and troilite. The olivine crystals have been converted into a mosaic of tiny grains, presumably by shock; the pyroxene crystals appear to be unaffected, and show polysynthetic twinning. Mineral compositions are slightly variable; mean values are olivine, Fa21; pyroxene, Wo4Fs19. The meteorite is a ureilite.

Data from:
  MB82
  Table A1
  Line 106:
Origin or pseudonym:Lower Central
Mass (g):1459.8
Class:Ur
Weathering grade:B
Fayalite (mol%):20-22
Ferrosilite (mol%):18-20
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 20(1) (1997), JSC, Houston
Published in Meteoritical Bulletin, no. 82, MAPS 33, A221-A240 (1998)
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Photos:
CreditPhotos
Photographs from AMN:
Photograph from unknown source A photo is in the write-up above
Photos from the Encyclopedia of Meteorites:
Dr Carlton Allen, JSC-KT, NASA   
Geography:

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

Statistics:
     This is 1 of 38674 approved meteorites from Antarctica (plus 5051 unapproved names)
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