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Allan Hills A79021
Basic information Name: Allan Hills A79021
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79021
This meteorite may also be called Allan Hills 79021 (ALH 79021) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 29.4 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 10910 approved meteorites (plus 20 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.: ALHA79021

Location: Allan Hills

Field No.: 1192

Weight (gms): 29.4

Meteorite Type: H5 Chondrite


Physical Description: Roberta Score

Stone is mostly covered with dull black fusion crust. The interior is light gray in color with reddish-brown oxidation scattered throughout. Inclusions are apparent. Dimensions: 4.5 x 2 x 1.5 cm.


Petrographic Description: Brian Mason

Chondritic structure is moderately well-developed, chondrules ranging up to 1.5 mm in diameter. The groundmass consists largely of granular olivine and pyroxene, with minor amounts of nickel-iron and troilite. Limonitic staining is present around the nickel-iron grains. One edge of the section is rimmed with fusion crust. Microprobe analyses gave the following compositions: olivine, Fa18; pyroxene, Fs17. The meteorite is classified as an H5 chondrite.

Data from:
  Table 2
  Line 459:
Origin or pseudonym:Main icefield
Mass (g):29.4
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):17
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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° 41' 44"S, 159° 21' 20"E)
Note: the NHM and MetBase coordinates are 8.3 km apart

     This is 1 of 43500 approved meteorites from Antarctica (plus 3802 unapproved names)
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