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Allan Hills A80102
Basic information Name: Allan Hills A80102
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA80102
This meteorite may also be called Allan Hills 80102 (ALH 80102) in publications.

Observed fall: No
Year found: 1980
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 471 g
Antarctic Meteorite Newsletter:  AMN 4(2)  (1981)  Eucrite-pmict
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-pmict
NHM Catalogue:  5th Edition  (2000)  Eucrite-pmict
MetBase:  v. 7.1  (2006)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 400 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeup from AMN 4(2):

Sample No.: ALHA80102

Location: Allan Hills

Field No.: 1020

Weight (gms): 471.2

Meteorite Type: Polymict Eucrite


Physical Description: Roberta Score

Shiny-black fusion crust covers all but one surface of this achondrite. The exterior surfaces have many vugs, typical of the other Allan Hills polymict eucrites, ranging in size from <1 mm to >1 cm. Chipping revealed an interior that is medium gray colored with mm sized white, yellow, and black clasts throughout. Several larger clasts (up to 1 cm. longest dimension) were noted. Dimensions: 12.5 x 8 x 5.5 cm.


Petrographic Description: Brian Mason

The section shows a breccia of angular fragments, up to 1 mm across, of pigeonite and plagioclase and a few lithic clasts, in a matrix of comminuted pyroxene and plagioclase. The lithic clasts consist of pyroxene and plagioclase and range in texture from doleritic to gabbroic. Accessory ilmenite was noted. No evidence of weathering was seen. Microprobe analyses show pigeonite ranging in composition from Wo6Fs34En60 to Wo12Fs52En36; a few grains of ferroaugite, averaging Wo33Fs30En37, were analyzed. Plagioclase ranges in composition from An76 to An94, with an average of An87. The meteorite is classified as a polymict eucrite (pyroxene-plagioclase achondrite), and resembles the other polymict eucrites collected at the Allan Hills.

Data from:
  Table 2
  Line 493:
Origin or pseudonym:Main icefield
Mass (g):471.2
Class:Eu "pm"
Weathering grade:A
Ferrosilite (mol%):34-52
Comments:26Al=83±5; 76005 pairing group
Search for specimens in the Smithsonian Institution collection (U.S.):   
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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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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 41' 25"S, 159° 15' 9"E)
Note: the NHM and MetBase coordinates are 11 km apart

     This is 1 of 44048 approved meteorites from Antarctica (plus 3802 unapproved names)
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