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Allan Hills A81107
Basic information Name: Allan Hills A81107
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81107
This meteorite may also be called Allan Hills 81107 (ALH 81107) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 139.6 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(2)  (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 11308 approved meteorites (plus 6 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)
Writeuphelp
Writeup from AMN 6(2):

Sample No.: ALHA81107

Location: Allan Hills

Field No.: 1438

Weight (gms): 139.6

Meteorite Type: L6 Chondrite

Physical Description: Roberta Score

No fusion crust remain typical equilibrated L-type chondrite. It is a rounded specimen with a light to medium gray interior. A discontinuous weathering rind of up to 0.5 cm is present. Dimensions: 6 x 4.5 x 3 cm

Petrographic Description: Brian Mason

Chondrules are few and poorly defined,  their margins merging with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of plagioclase, nickel-iron, and troilite. Weathering is minor, being limited to brown limonitic staining around metal grains. Microprobe analyses gave the following results: olivine, Fa24, orthopyroxene, Fs21; plagioclase, An11; one grain of diopside, Wo46En47Fs7 was identified. "The meteorite is an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 630:
Origin or pseudonym:Main icefield
Mass (g):139.6
Class:L6
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):21
Comments:26Al=70┬▒3; 80101 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 6(2) (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° 46' 27"S, 159° 16' 59"E)
Note: the NHM and MetBase coordinates are 11.7 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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