Meteoritical Bulletin: Entry for Allan Hills A81004

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Allan Hills A81004

Basic information

Name: Allan Hills A81004
This is an OFFICIAL meteorite name.
Abbreviation: ALHA81004
This meteorite may also be called Allan Hills 81004 (ALH 81004) in publications.
Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 4.7 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 6(1)	(1983)	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 636 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 6(1):

Sample No.: ALHA81004

Location: Allan Hills

Field No.: 1429

Weight (gms): 4.7

Meteorite Type: C2 Carbonaceous Chondrite

Physical Description: Roberta Score

Dull black fusion crust covers most of this carbonaceous chondrite. Along one edge the fusion crust has a blistery texture. Small white irregular and rounded inclusions are visible in the black matrix. Several small oxidation haloes were noted. Dimensions: 3.0 x 1.5 x 1.0 cm.

Petrographic Description: Brian Mason

This section is similar to that of ALHA81002 in all respects, and the range and distribution of olivine compositions is the same. It is therefore tentatively paired with that meteorite, and also with ALHA77306 and ALHA78261, previously described C2 chondrites from the Allan Hills.

Data from:
  MB76
  Table 2
  Line 527:

Origin or pseudonym:	Middle Western
Mass (g):	4.7
Class:	CM2
Weathering grade:	A/B
Fayalite (mol%):	0-52
Ferrosilite (mol%):	0-2
Comments:	81002 pairing group

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
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References:

Published in Antarctic Meteorite Newsletter 6(1) (1983), 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° 49' 6"S, 158° 10' 24"E)

Note: the NHM and MetBase coordinates are 39.8 km apart

Statistics:
This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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