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Allan Hills A80106
Basic information Name: Allan Hills A80106
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA80106
This meteorite may also be called Allan Hills 80106 (ALH 80106) in publications.

Observed fall: No
Year found: 1980
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 432 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(2)  (1981)  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 5778 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 4(2):

Sample No.: ALHA80106

Location: Allan Hills

Field No.: 1021, 1022

Weight (gms): 432.2

Meteorite Type: H4 Chondrite

 

Physical Description: Carol Schwarz

ALHA80106 consists of five pieces, one of which had a different field number. That piece plus three others fit together. The fifth piece does not. The sample has patches of shiny black fusion crust on all sides except T which appears to be a fracture surface. Areas devoid of fusion crust are smooth and reddish brown. The interior of this stone is totally weathered. Dimensions: 6 x 9.5 x 10 cm.

 

Petrographic Description: Brian Mason

Chondritic structure is well developed, with chondrules ranging from 0.2-1.2 mm across; the commonest types are granular and porphyritic olivine, barred olivine, and fine-grained radiating pyroxene. The chondrules are set in a fine-grained granular groundmass of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Some of the pyroxene is polysynthetically twinned clinobronzite. Weathering is pervasive, with brown limonitic staining throughout the section. Microprobe analyses show uniform olivine com-position (Fa19) and moderately variable pyroxene (Fa16-19, average Fs17). The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 497:
Origin or pseudonym:Main icefield
Mass (g):432.2
Class:H4
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):16-19
Comments:26Al=52±3; 80106 pairing group
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° 41' 25"S, 159° 15' 16"E)
Note: the NHM and MetBase coordinates are 11 km apart

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