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Allan Hills A81119
Basic information Name: Allan Hills A81119
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81119
This meteorite may also be called Allan Hills 81119 (ALH 81119) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 107.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(2)  (1983)  L4
Meteoritical Bulletin:  MB 76  (1994)  L4
NHM Catalogue:  5th Edition  (2000)  L4
MetBase:  v. 7.1  (2006)  L4
Recommended:  L4    [explanation]

This is 1 of 1601 approved meteorites (plus 4 unapproved names) classified as L4.   [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.: ALHA81119

Location: Allan Hills

Field No.: 1283

Weight (gms): 107.4

Meteorite Type: L4 Chondrite

 

Physical Description: Roberta Score

ALHA81119 is not a complete specimen. One-side of this meteorite is rounded and has thin black fusion crust while the opposite side is flat, greenish in color and clast-rich. Several troilite grains are present on the surface. The interior matrix is medium-gray with scattered areas of heavy oxidation. Dimensions: 6.5 x 4.5 x 2 cm

 

Petrographic Description: Brian Mason

rules are abundant and varied in texture, and are set in a fine-grained granular groundmass consisting largely of olivine and pyroxene. Some of the pyroxene is polysynthetically twinned clinobronzite. Minor subequal amounts of nickel-iron and troilite are present, in grains up to 0.5 mm across. Minor weathering is indicated by brown limonitic staining around metal grains. Microprobe analyses gave the following results: olivine, Fa24; Pyroxene, Fs21. The meteorite is classified as an L4 chondrite.

Data from:
  MB76
  Table 2
  Line 642:
Origin or pseudonym:Near Western
Mass (g):107.4
Class:L4
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):21
Comments:26Al=36±2
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° 43' 2"S, 158° 42' 50"E)
Note: the NHM and MetBase coordinates are 24.4 km apart

Statistics:
     This is 1 of 38940 approved meteorites from Antarctica (plus 5051 unapproved names)
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