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Allan Hills A79022
Basic information Name: Allan Hills A79022
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79022
This meteorite may also be called Allan Hills 79022 (ALH 79022) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 31.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  H3
AMN 7(1)  (1984)  L3,4
Meteoritical Bulletin:  MB 76  (1994)  L3.7/4
NHM Catalogue:  5th Edition  (2000)  L3.7/4
MetBase:  v. 7.1  (2006)  L3.7-4
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  L3.7-4
Recommended:  L3.7-4    [explanation]

This is the only approved meteorite classified as L3.7-4.
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 4(2):

Sample No.: ALHA79022

Location: Allan Hills

Field No.: 1151

Weight (gms): 31.4

Meteorite Type: H3 Chondrite

 

Physical Description: Roberta Score

Stone is mostly covered with dull black fusion crust. The areas devoid of fusion crust appear to have been spalled off or preferentially plucked off because they occur along ridges. These areas are clastic and yellowish-green in color. Several fractures cut into the interior of the sample. Upon chipping, the meteorite crumbled but a relatively fresh interior was exposed. Many inclusions of various colors are visible (from black to white). The largest inclusion is white in color and 0.7 cm in its longest dimension. A small (<1 mm) weathering rind is visible. No metal is obvious but a few oxidation haloes are. Dimensions: 3.5 x 2.5 x 2 cm.

 

Petrographic Description: Brian Mason

Chondritic structure is well-developed, with chondrules ranging up to 1.3 mm in diameter; some have dark rims consisting largely of troilite. Intergranular glass is present in many of the chondrules; most of it is turbid and partly devitrified, but some is transparent and pale brown. The groundmass consists largely of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite; limonitic staining is present around the metal grains. Much of the pyroxene of variable composition: olivine, Fa1-28, average Fa17, and pyroxene, Fs9-22, average Fs16. The meteorite is classified as an H3 chondrite.

Data from:
  MB76
  Table 2
  Line 460:
Origin or pseudonym:Main icefield
Mass (g):31.4
Class:L3.7/4
Weathering grade:A/B
Fayalite (mol%):1-28
Ferrosilite (mol%):9-22
Comments:26Al=44±6
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 4(2) (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' 7"S, 159° 23' 38"E)
Note: the NHM and MetBase coordinates are 7.2 km apart

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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