Meteoritical Bulletin: Entry for Grosvenor Mountains 85202

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Grosvenor Mountains 85202

Basic information

Name: Grosvenor Mountains 85202
This is an OFFICIAL meteorite name.
Abbreviation: GRO 85202
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 27.2 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 9(3)	(1986)	C2
Meteoritical Bulletin:	MB 76	(1994)	C2
NHM Catalogue:	5th Edition	(2000)	C2
MetBase:	v. 7.1	(2006)	CM2
Antarctic Meteorite Newsletter:	AMN 31(1)	(2008)	CM2
Recommended:			CM2 [explanation]

This is 1 of 544 approved meteorites classified as CM2. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites

Writeup

Writeup from AMN 9(3):

Sample No.: GRO85202

Location: Grosvenor Mountains

Weight (g): 27.2

Field No.: 2053

Dimensions (cm): 4 x 3.5 x 3.5

Meteorite Type: C2 Chondrite

Macroscopic Description: René Martinez

Thin fractured fusion crust covers two sides of this carbonaceous chondrite. Fusion crust appeared to be the only thing holding the sample together as it was highly fractured and disintegrated when the stone was chipped. The interior is fine-grained with no inclusions visible. Minute evaporite deposit lines some of the interior fractures.

Thin Section (,4) Description: Brian Mason

The section shows a dark brown to black matrix with numerous mineral grains and aggregates and rare small chondrules. Most of the mineral grains and aggregates consist of an isotropic to weakly birefringent serpentine-like mineral. A few grains of olivine near Mg2SiO4 in composition were analysed; some grains of calcite were noted. The meteorite is a C2 chondrite.

Data from:
  MB76
  Table 2
  Line 2851:

Mass (g):	27.2
Class:	C2
Weathering grade:	A/Be
Fayalite (mol%):	0.8-1.2

Catalogs:

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References:

Published in Antarctic Meteorite Newsletter 9(3) (1986), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)

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Geography:

Antarctica

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

Statistics:
This is 1 of 40719 approved meteorites from Antarctica (plus 4494 unapproved names)

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