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Allan Hills A79012
Basic information Name: Allan Hills A79012
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79012
This meteorite may also be called Allan Hills 79012 (ALH 79012) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 191.9 g
Classification
  history:
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 9655 approved meteorites (plus 16 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)
Writeuphelp
Writeup from AMN 4(1):

Sample No.: ALHA79012

Location: Allan Hills

Field No.: 1052

Weight (gms): 191.9

Meteorite Type: H5 Chondrite

 

Physical Description: Roberta Score

Fusion crust exists as thin patches over all but one surface. Several cracks penetrate the interior of this meteorite. The overall color of the stone is a deep reddish-brown. No unweathered material was exposed when the sample was chipped. Dimensions: 9 x 5.5 x 3.5 cm.

 

Petrographic Description: Brian Mason

Chondritic structure is well-developed, with chondrules 0.5-1.2 mm in diameter. The chondrules are set in a fine-grained matrix consisting largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Weathering is extensive, with limonitic staining and areas of red-brown limonite throughout the section. Remnants of fusion crust are present along one edge. Microprobe analyses gave the following compositions: olivine, Fa17; pyroxene, Fs15; accessory merrillite was identified. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 450:
Origin or pseudonym:Main icefield
Mass (g):191.9
Class:H5
Weathering grade:C
Fayalite (mol%):17
Ferrosilite (mol%):15
Comments:26Al=52±3
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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