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Allan Hills A79004
Basic information Name: Allan Hills A79004
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79004
This meteorite may also be called Allan Hills 79004 (ALH 79004) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 34.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  H5 w/enclaves
AMN 13(1)  (1990)  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 9655 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 4(1):

Sample No.: ALHA79004

Location: Allan Hills

Field No.: 1159

Weight (gms): 34.9

Meteorite Type: H5 Chondrite with enclaves

 

Physical Description: Roberta Score

Most of this tabular stone has been weathered to a reddish-brown color. Patches of yellow are visible on one surface. Approximately 5% of the interior is gray in color while the remaining material has been weathered to a deep reddish-brown color. Dimensions: 5 x 3 x 1.5 cm.

 

Petrographic Description: Brian Mason

The section shows well-developed chondritic structure, with chondrules ranging from 0.2-1.2 mm in diameter; a variety of types is present, the commonest being granular and porphyritic olivine and fine-grained pyroxene. The matrix is fine to medium-grained, and consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. An enclave of granular polysynthetically twinned clinopyroxene, 2.4 mm across, is present on one edge of the section. The specimen is somewhat weathered, with brown limonitic staining throughout the section. Microprobe analyses show olivine (Fa16) and pyroxene (Fs14) of essentially uniform composition in the chondrules and groundmass; the composition of the pyroxene in the enclave is variable, as follows: Wo0.6-3.7, En 60-85, Fs11-38. The meteorite is classified as an H5 chondrite, although the enclave properly belongs to a lower type.

Data from:
  MB76
  Table 2
  Line 442:
Origin or pseudonym:Main icefield
Mass (g):34.9
Class:H5
Weathering grade:B/C
Fayalite (mol%):16
Ferrosilite (mol%):14
Comments:26Al=34±6
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     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

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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