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Grosvenor Mountains 95566
Basic information Name: Grosvenor Mountains 95566
     This is an OFFICIAL meteorite name.
Abbreviation: GRO 95566
Observed fall: No
Year found: 1995
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 50.7 g
Antarctic Meteorite Newsletter:  AMN 20(1)  (1997)  C2
Meteoritical Bulletin:  MB 82  (1998)  C2
NHM Catalogue:  5th Edition  (2000)  C2
MetBase:  v. 7.1  (2006)  C2-ung
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  C2-ung
AMN 41(1)  (2018)  CM-an
Recommended:  CM-an    [explanation]

This is 1 of 10 approved meteorites classified as CM-an.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Revised 3 Jun 2019: reclassified in AMN 41(1)
Writeup from AMN 20(1):
Sample No.:GRO95566
Location:Grosvernor Mountains
Dimensions (cm):4.0 x 3.5 x 2.5
Weight (g):50.7
Meteorite Type:C2 Chondrite

Macroscopic Description: Kathleen McBride
The exterior of this carbonaceous chondrite is covered with black fusion crust. The surface is vesicular and displays polygonal fractures. It has a rough texture and is friable. One surface lacks fusion crust. The black interior reveals white material between the fusion crust and the meteorite, which may be evaporite. The numerous chondrules are less than 1 mm in size. Some condrules appear to be rusty.

Thin Section (,5) Description: Brian Mason
The section shows numerous small chondrules (up to 0.6 mm across), some irregular aggregates, and many small silicate grains in a black matrix; trace amounts of nickel-iron and troilite are present as minute grains. The silicate grains are almost entirely olivine near Mg2 SiO4 in composition, with a few more iron-rich grains. A little pyroxene near MgSiO3 in composition is present. The matrix appears to consist largely of iron-rich serpentine. The meteorite is a C2 chondrite.

Writeup from AMN 41(1):
GRO 95566: reclassification

Listed by Choe et al. (2010) as CM-anomalous
  • Choe W. H., Huber H., Rubin A.E., Kallemeyn G. W., and Wasson J. T. (2010) Compositions and taxonomy of 15 unusual carbonaceous chondrites. Meteorit. Planet. Sci. 45, 531-554 (link)
Data from:
  Table A1
  Line 200:
Origin or pseudonym:Outer Cecily
Mass (g):50.7
Weathering grade:A/Be
Fayalite (mol%):1-35
Ferrosilite (mol%):2-4
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References: Published in Antarctic Meteorite Newsletter 20(1) (1997), JSC, Houston
Published in Antarctic Meteorite Newsletter 41(1) (2018), 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
Photos from the Encyclopedia of Meteorites:
courtesy Dr Carlton Allen, JSC-KT, NASA   

     Catalogue of Meteorites:   (85° 40'S, 175° 0'E)
     Recommended::   (85° 40'S, 175° 0'E)

     This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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