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Allan Hills A79031
Basic information Name: Allan Hills A79031
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79031
This meteorite may also be called Allan Hills 79031 (ALH 79031) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 2.7 g
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  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 11150 approved meteorites (plus 22 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)
Writeup from AMN 4(1):

Sample No.: ALHA79031

Location: Allan Hills

Field No.: 1178

Weight (gms): 2.7

Meteorite Type: H5 Chondrite


Physical Description: Roberta Score

The stone is totally weathered. ALHA79031 and ALHA79032 are probably the same meteorite based on

Field Notes and hand specimen observation. Dimensions: 2.0 x 1.5 x 0.5 cm.


Petrographic Description: Brian Mason

Chondritic structure is fairly well-developed, with chondrules ranging up to 1.5 mm across. The chondrules are set in a matrix of fine-to medium-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite. Weathering is extensive, the section being pervaded with red-brown limonite. Microprobe analyses gave the following compositions: olivine, Fa16; pyroxene, Fs14; accessory merrillite was identified with the microprobe. The meteorite is classified as an H5 chondrite.

Data from:
  Table 2
  Line 468:
Origin or pseudonym:Main icefield
Mass (g):2.7
Weathering grade:C
Fayalite (mol%):16
Ferrosilite (mol%):14
Comments:79031 pairing group
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References: Published in Antarctic Meteorite Newsletter 4(1) (1981), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 42' 11"S, 159° 23' 35"E)
Note: the NHM and MetBase coordinates are 7.2 km apart

     This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)
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