Meteoritical Bulletin: Entry for Allan Hills A81026

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Allan Hills A81026

Basic information

Name: Allan Hills A81026
This is an OFFICIAL meteorite name.
Abbreviation: ALHA81026
This meteorite may also be called Allan Hills 81026 (ALH 81026) in publications.
Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 516 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 6(1)	(1983)	L6
Meteoritical Bulletin:	MB 76	(1994)	L6
NHM Catalogue:	5th Edition	(2000)	L6
MetBase:	v. 7.1	(2006)	L6
Recommended:			L6 [explanation]

This is 1 of 12478 approved meteorites (plus 8 unapproved names) classified as L6. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Writeup

Writeup from AMN 6(1):

Sample No.: ALHA81026

Location: Allan Hills

Field No.: 1149

Weight (gms): 515.5

Meteorite Type: L6 Chondrite

Physical Description: Roberta Score

Dull black fusion crust covers some of this knobby-looking equilibrated chondrite. The interior, exposed by chipping, appears fresh with some haloes around the metal grains. Dimensions: 11 x 5.5 x 6 cm.

Petrographic Description: Brian Mason

Chondrules are sparse, with diffuse boundaries that merge with the granular groundmass, which consists largely of olivine and pyroxene with minor amounts of plagioclase, nickel-iron, and troilite. Weathering is restricted to minor brown limonitic staining around metal grains. Microprobe analyses gave the following compositions: olivine, Fa25; orthopyroxene, Fs21; plagioclase, An10; a grain of apatite was analyzed. The meteorite is an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 549:

Origin or pseudonym:	Main icefield
Mass (g):	515.5
Class:	L6
Weathering grade:	B
Fayalite (mol%):	25
Ferrosilite (mol%):	21
Comments:	26Al=63±3

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° 40' 53"S, 159° 20' 48"E)

Note: the NHM and MetBase coordinates are 9.1 km apart

Statistics:
This is 1 of 44048 approved meteorites from Antarctica (plus 3802 unapproved names)

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