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Allan Hills A80121
Basic information Name: Allan Hills A80121
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA80121
This meteorite may also be called Allan Hills 80121 (ALH 80121) in publications.

Observed fall: No
Year found: 1980
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 39.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 5(1)  (1982)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 5782 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 5(1):

Sample No.: ALHA80121

Location: Allan Hills

Field No.: 1110

Weight (gms): 39.1

Meteorite Type: H4 Chondrite

 

Physical Description: Carol Schwarz

The sample has no fusion crust and is severely fractured and weathered to a deep reddish brown. The interior is yellowish in color from weathering. It is quite friable. Dimensions: 4 x 3 x 2 cm

 

Petrographic Description: Brian Mason

Chondritic structure is well developed, with chondrules ranging up to 1.2 mm in diameter. A variety of chondrules is present, the commonest being granular olivine and olivine-pyroxene, barred olivine, and radiating pyroxene; some of the pyroxene is twinned clinobronzite. Considerable weathering is indicated by extensive limonitic staining around metal grains. Microprobe analyses gave the following compositions: olivine, Fa19; pyroxene Fs17. The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 511:
Origin or pseudonym:Main icefield
Mass (g):39.1
Class:H4
Weathering grade:B/C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=66±6; 80106 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 5(1) (1982), 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' 36"S, 159° 22' 9"E)
Note: the NHM and MetBase coordinates are 7.7 km apart

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