Meteoritical Bulletin: Entry for Allan Hills 82131

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Allan Hills 82131

Basic information

Name: Allan Hills 82131
This is an OFFICIAL meteorite name.
Abbreviation: ALH 82131
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 1 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 7(2)	(1984)	C2
	AMN 17(1)	(1994)	CM2
Meteoritical Bulletin:	MB 76	(1994)	CM2
NHM Catalogue:	5th Edition	(2000)	CM2
MetBase:	v. 7.1	(2006)	CM2
Recommended:			CM2 [explanation]

This is 1 of 625 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 7(2):

Sample No.: ALH82131

Location: Allan Hills

Field No.: 2913

Weight (gms): 1.0

Meteorite type: C2 chondrite

Physical Description: Roberta Score

One small patch of blistery fusion crust remains on this small meteorite fragment. The color of the exterior surfaces is black with a greenish tinge. The interior matrix is black and contains many submillimeter sized white inclusions. A green colored weathering rind extends approximately 1 mm into the interior of the stone. Dimensions: 1 x 1 x 0.5 cm

Petrographic Description: Brian Mason

The very small section shows a single chondrule in black opaque matrix. Microprobe analyses show that the matrix has the composition characteristic of C2 chondrites. Olivine in the chondrule is almost pure forsterite (FeO, 0.3%; CaO, 0.3-0.4%). The meteorite is a C2 chondrite.

Data from:
  MB76
  Table 2
  Line 870:

Origin or pseudonym:	Far Western
Mass (g):	1
Class:	CM2
Weathering grade:	A
Fayalite (mol%):	0.3
Comments:	81002 pairing group

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):

References:

Published in Antarctic Meteorite Newsletter 7(2) (1984), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)

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Geography:

Antarctica

Coordinates:
Catalogue of Meteorites:	(76° 43'S, 159° 40'E)
Recommended::	(76° 53' 1"S, 156° 55' 41"E)

Note: the NHM and MetBase coordinates are 72.3 km apart

Statistics:
This is 1 of 43857 approved meteorites from Antarctica (plus 3802 unapproved names)

Proximity search:

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