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Allan Hills 82132
Basic information Name: Allan Hills 82132
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 82132
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 5.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(2)  (1984)  E4
Meteoritical Bulletin:  MB 76  (1994)  E4
NHM Catalogue:  5th Edition  (2000)  EH4
MetBase:  v. 7.1  (2006)  EH4
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  EH4
Recommended:  EH4    [explanation]

This is 1 of 20 approved meteorites classified as EH4.   [show all]
Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites
Writeuphelp
Writeup from AMN 7(2):

Sample No.: ALH82132

Location: Allan Hills

Field No.: 2983

Weight (gms): 5.9

Meteorite Type: E4 Chondrite

Physical Description: Roberta Score

Some fusion crust remains on this otherwise iridescent reddish-brown, highly oxidized stone. Thin evaporite deposit coats some of the extensively weathered interior surfaces. Dimensions: 2 x 2 x 1 cm

Petrographic Description: Brian Mason

Chondrules are relatively abundant, but are small, ranging up to 0.6 mm in diameter; most of them consist of pyroxene, but some are made up entirely or almost entirely of nickel-iron and troilite. The matrix consists largely of granular pyroxene, with lesser amounts of nickel-iron and sulfides, and a little plagioclase and a silica polymorph. The meteorite is considerably weathered, with brown limonitic staining throughout the section. Microprobe analyses show that the pyroxene is almost pure MgSiO3 (FeO 0.06-0.7, mean 0.3%; A12O3 0-0.3, mean 0.04%; CaO 0.02-0.6, mean 0.16%; TiO2, MnO, less than 0.05%). Plagioclase is almost pure albite (CaO 0.02%, K2O 0.11%). The meteorite is an enstatite chondrite, and since part of the pyroxene is polysynthetically twinned clinoenstatite, it is classified as an E4 chondrite.

Data from:
  MB76
  Table 2
  Line 871:
Origin or pseudonym:Far Western
Mass (g):5.9
Class:E4
Weathering grade:Ce
Ferrosilite (mol%):0.4
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 7(2) (1984), 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° 58' 33"S, 156° 56' 55"E)
Note: the NHM and MetBase coordinates are 74.9 km apart

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