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Allan Hills A80128
Basic information Name: Allan Hills A80128
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA80128
This meteorite may also be called Allan Hills 80128 (ALH 80128) in publications.

Observed fall: No
Year found: 1980
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 138.2 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.: ALHA80128

Location: Allan Hills

Field No.: 1026

Weight (gms): 138.2

Meteorite Type: H4 Chondrite

 

Physical Description: Roberta Score

Dull black fusion crust covers all but one surface of this meteorite. Several large fractures penetrate the specimen. Chipping exposed a medium gray interior speckled with white and dark gray inclusions. Dimensions: 5 x 4.5 x 4 cm

 

Petrographic Description: Brian Mason

Chondrules are prominent, ranging up to 0.9 mm in diameter. They are set in a granular groundmass of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Brown limonitic staining occurs throughout the section, being concentrated around the nickel-iron grains. Traces of fusion crust are present along one edge. Microprobe analyses gave the following compositions: olivine, Fa18; pyroxene, Fs16 (somewhat variable, Fs15-20); one grain of diopside, Wo45Fs7 was analyzed. The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 518:
Origin or pseudonym:Main icefield
Mass (g):138.2
Class:H4
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):15-20
Comments:26Al=59±4; 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° 41' 19"S, 159° 15' 24"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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