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Allan Hills A79011
Basic information Name: Allan Hills A79011
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79011
This meteorite may also be called Allan Hills 79011 (ALH 79011) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 14 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.: ALHA79011

Location: Allan Hills

Field No.: 1150

Weight (gms): 14.0

Meteorite Type: H5 Chondrite


Physical Description: Roberta Score

This rounded stone is totally covered with weathered dull brown and black fusion crust. The interior is mostly weathered but some light gray colored matrix is visible which contains several weathered rounded inclusions (<1 mm diameter). Dimensions: 2 x 2 x 1.5 cm.


Petrographic Description: Brian Mason

Chondritic structure is fairly well-developed, but the chondrules are small, ranging up to 0.6 mm across. They are set in a fine- to medium-grained matrix, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Fusion crust, up to 0.5 mm thick, rims part of the section. Some limonitic staining is present, mainly in association with nickel-iron grains. Microprobe analyses gave the following mineral compositions: olivine, Fa18; pyroxene, Fs16. Accessory merrillite was identified with the microprobe. The meteorite is classified as an H5 chondrite.

Data from:
  Table 2
  Line 449:
Origin or pseudonym:Main icefield
Mass (g):14
Weathering grade:B/C
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° 42' 9"S, 159° 22' 0"E)
Note: the NHM and MetBase coordinates are 7.9 km apart

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