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Allan Hills A79025
Basic information Name: Allan Hills A79025
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79025
This meteorite may also be called Allan Hills 79025 (ALH 79025) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1208 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 10985 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.: ALHA79025 [printed as 77025]

Location: Allan Hills

Field No.: 1050

Weight (gms): 1208.0

Meteorite Type: H5 Chondrite


Physical Description: Carol Schwarz

This is not a complete specimen. Thin black fusion crust covers only two surfaces. The other surfaces are weathered and reddish-brown in color with some inclusions visible. The meteorite was very hard and difficult to chip but no unweathered material was exposed. Dimensions: 10 x 13 x 7 cm.


Petrographic Description: Brian Mason

Chondrules are well-defined, 0.3-1.2 mm in diameter; they are set in a granular groundmass of olivine and pyroxene, with minor amounts of nickel-iron and troilite, and accessory chromite. Weathering is extensive, with veins and patches of limonite throughout the section. Microprobe analyses show olivine (Fa17) and orthopyroxene (Fs15) of uniform composition; a few small grains of plagioclase (An13) were analysed. The meteorite is classified as an H5 chondrite.

Data from:
  Table 2
  Line 463:
Origin or pseudonym:Main icefield
Mass (g):1208
Weathering grade:C
Fayalite (mol%):17
Ferrosilite (mol%):15
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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 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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