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Grosvenor Mountains 95551
Basic information Name: Grosvenor Mountains 95551
     This is an OFFICIAL meteorite name.
Abbreviation: GRO 95551
Observed fall: No
Year found: 1995
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 213 g
Antarctic Meteorite Newsletter:  AMN 20(2)  (1997)  Chondrite-an
Meteoritical Bulletin:  MB 82  (1998)  Chondrite-ung
NHM Catalogue:  5th Edition  (2000)  Chondrite-ung
MetBase:  v. 7.1  (2006)  Chondrite-ung
Recommended:  Chondrite-ung    [explanation]

This is 1 of 22 approved meteorites classified as Chondrite-ung.   [show all]
Search for other: Ungrouped chondrites
Writeup from AMN 20(2):
Sample No.: GRO95551
Location: Grosvenor Mountains
Dimensions (cm): 6.5x4.0x4.0
Weight (g): 213.389
Meteorite Type: Chondrite (Anomalous)
Processing Photos

Macroscopic Description: Kathleen McBride
The exterior of this unusual meteorite has thin patches of black fusion crust. Most of the surface has a rusty brown melted appearance with exposed clasts. The clasts are large, rounded and greenish-white with coarse crystalline textures. The interior is rusty and heavily weathered. A variety of inclusions are visible, some are black, very fine-grained and angular. There are a number of rounded objects less then 2-3 mm that could be chondrules. One large clast is greenish-yellow in color, others are rusty. This metorite was very coherent and difficult to break.

Thin Section (,2,11,13,15) Description: Brian Mason
The sections show a breccia of two types of clasts, chondritic and achondritic. The chondritic clasts range up to 15+ mm, and consist of a variety of chondrules and chondrule fragments (up to 1.8 mm across) in a matrix of nickel-iron with minor troilite. Microprobe analyses of the chondrules gave the following compositions: olivine, Fa1-2; pyroxene, Fs1, with a few more iron-rich grains. The nickel-iron contains no silicon. The achondritic clasts are up to 11 mm across and consist of highly-shocked enstatite (or clinoenstatite). GRO 95551,15 contains a fine-grained carbonaceous clast, 3.6 mm across. The meteorite is anomalous, and resembles Bencubbin (Geochim. Cosmochim. Acta, v.42, p.507, 1978) and Weatherford (Geochim, Cosmochim, Acta, v.32, p.661, 1968).

GRO95551 TS - Plane Polarized Light GRO95551 TS - Cross Polarized Light
Plane-Polarized Light Cross-Polarized Light
Data from:
  Table A1
  Line 185:
Origin or pseudonym:Outer Cecily
Mass (g):213.4
Class:Ch ung
Weathering grade:C
Fayalite (mol%):1-2
Ferrosilite (mol%):1
Plots: O isotopes:  
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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
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 44593 approved meteorites from Antarctica (plus 3805 unapproved names)
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