Meteoritical Bulletin: Entry for Allan Hills A81093

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Allan Hills A81093

Basic information

Name: Allan Hills A81093
This is an OFFICIAL meteorite name.
Abbreviation: ALHA81093
This meteorite may also be called Allan Hills 81093 (ALH 81093) in publications.
Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 271 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 6(1)	(1983)	H6
Meteoritical Bulletin:	MB 76	(1994)	H6
NHM Catalogue:	5th Edition	(2000)	H6
MetBase:	v. 7.1	(2006)	H6
Recommended:			H6 [explanation]

This is 1 of 6825 approved meteorites (plus 6 unapproved names) classified as H6. [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Writeup

Writeup from AMN 6(1):

Sample No.: ALHA81093

Location: Allan Hills

Field No.: 1488

Weight (gms): 271.0

Meteorite Type: H6 Chondrite

Physical Description: Roberta Score

Dull black fusion crust totally covers this meteorite. The interior has a discontinuous weathering rind with oxidation evenly distributed throughout. Small light and dark inclusions are visible in the gray-white matrix. Dimensions: 6 x 5.5 x 4 cm.

Petrographic Description: Brian Mason

Chondritic structure is barely perceptible, the few chondrules being extensively integrated with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron, troilite, and plagioclase. Limonitic staining and small areas of limonite are present throughout the section. Microprobe analyses give the following compositions: olivine, Fa20; orthopyroxene, Fs17; plagioclase, An12. The meteorite is an H6 chondrite.

Data from:
  MB76
  Table 2
  Line 616:

Origin or pseudonym:	Main icefield
Mass (g):	271
Class:	H6
Weathering grade:	A/B
Fayalite (mol%):	20
Ferrosilite (mol%):	17

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 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° 43'S, 159° 40'E)

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

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Revision
history:

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