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Allan Hills A81015
Basic information Name: Allan Hills A81015
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81015
This meteorite may also be called Allan Hills 81015 (ALH 81015) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 5.49 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 9999 approved meteorites (plus 16 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 6(1):

Sample No.: ALHA81015

Location: Allan Hills

Field No.: 1652

Weight (gms): 5489.0

Meteorite Type: H5 Chondrite

 

Physical Description: Carol Schwarz

Thin fusion crust is black to brown and covers about 70% of the specimen. White deposit occurs on one face. The interior has a partial weathering rind of up to ~1 cm in width. Oxidation haloes are numerous in the matrix. Dimensions: 20 x 15 x 9.5 cm.

 

Petrographic Description: Brian Mason

Chondritic structure is well developed, with chondrules up to 1.2 mm across, but chondrule margins tend to merge with the granular groundmass, which consists largely of olivine and pyroxene with minor amounts of nickel-iron and troilite. Veinlets of brown limonite are present near the surface, and limonitic staining is extensive around metal grains. Microprobe analyses give the following compositions: olivine, Fa19; orthopyroxene, Fs16. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 538:
Origin or pseudonym:Near Western
Mass (g):5489
Class:H5
Weathering grade:Be
Fayalite (mol%):19
Ferrosilite (mol%):16
Comments:26Al=49±3
Catalogs:
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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° 42' 49"S, 158° 46' 53"E)
Note: the NHM and MetBase coordinates are 22.7 km apart

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