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Allan Hills A79020
Basic information Name: Allan Hills A79020
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79020
This meteorite may also be called Allan Hills 79020 (ALH 79020) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 4.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  H6
Meteoritical Bulletin:  MB 76  (1994)  H6
NHM Catalogue:  5th Edition  (2000)  H6
MetBase:  v. 7.1  (2006)  H6
Recommended:  H6    [explanation]

This is 1 of 5857 approved meteorites (plus 5 unapproved names) classified as H6.   [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.: ALHA79020

Location: Allan Hills

Field No.: 1186

Weight (gms): 4.2

Meteorite Type: H6 Chondrite

 

physical Description: Roberta Score

Most of the stone is covered with dull brown and black fusion crust. Areas devoid of fusion crust range in color from yellow to reddish-brown. In these areas, inclusions are visible. Several fractures penetrate the interior of the stone. Dimensions: 2 x 1.5 x 1 cm.

 

Petrographic Description: Brian Mason

Chondritic structure is poorly developed, the sparse chondrules tending to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of plagioclase, nickel-iron, and troilite. Remnants of fusion crust rim much of the section. A moderate amount of limonitic staining is present around the nickel-iron grains. Microprobe analyses gave the following mineral compositions: olivine, Fa17; pyroxene, Fs15; plagioclase, An14. The meteorite is classified as an H6 chondrite.

Data from:
  MB76
  Table 2
  Line 458:
Origin or pseudonym:Main icefield
Mass (g):4.2
Class:H6
Weathering grade:B/C
Fayalite (mol%):17
Ferrosilite (mol%):15
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° 40' 55"S, 159° 19' 12"E)
Note: the NHM and MetBase coordinates are 9.7 km apart

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