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Allan Hills A79026
Basic information Name: Allan Hills A79026
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79026
This meteorite may also be called Allan Hills 79026 (ALH 79026) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 572 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 10884 approved meteorites (plus 19 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.: ALHA79026

Location: Allan Hills

Field No.: 1056

Weight (gms): 572.0 M

Meteorite Type: H5 Chondrite


Physical Description: Roberta Score

The shape of this meteorite is angular with flat faces. It is covered with a very thin black to brown fusion crust., The interior material is friable and a fractured. Some fresh metal flecks are visible. The matrix is gray with oxidation haloes scattered throughout. A weathering rind from 1 to 5 mm is apparent in some areas. Dimensions: %9 x 6 x 5.5 cm.


Petrographic Description: Brian Mason

Chondritic structure is moderately well-developed; most chondrules are ~1 mm in diameter, but some larger ones are present; one consisting of granular olivine with interstitial devitrified glass is 3 mm across. The matrix is fine- to medium-grained, and consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Brown limonitic staining is present around the nickel-iron grains. Microprobe analyses show olivine (Fa18) and orthopyroxene (Fs16) of uniform composition; a little fine-grained plagioclase (An13) was identified with the microprobe. The meteorite is classified as an H5 chondrite.

Data from:
  Table 2
  Line 464:
Origin or pseudonym:Main icefield
Mass (g):572
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):16
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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° 43'S, 159° 40'E)

     This is 1 of 43352 approved meteorites from Antarctica (plus 3802 unapproved names)
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