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Allan Hills A81002
Basic information Name: Allan Hills A81002
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81002
This meteorite may also be called Allan Hills 81002 (ALH 81002) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 14 g
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  C2
AMN 17(1)  (1994)  CM2
Meteoritical Bulletin:  MB 76  (1994)  CM2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Recommended:  CM2    [explanation]

This is 1 of 622 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeup from AMN 6(1):

Sample No.: ALHA81002

Location: Allan Hills

Field No.: 1591

Weight (gms): 14.0

Meteorite Type: C2 Carbonaceous Chondrite

Physical Description: Roberta Score

No fusion crust remains on this friable, jet black colored carbonaceous chondrite. The overall shape is pyramidal. Rounded inclusions which show relief from the surface are visible on the exterior. A minute amount of white deposit is present on one surface. The interior contains a few small (<1 mm) white irregular shaped inclusions plus several chondrules and irregular shaped black inclusions. Dimensions: 2.5 x 2.5 x 2.5 cm.

Petrographic Description: Brian Mason

The section shows numerous small colorless grains (up to 0.1 mm) and irregular aggregates (up to 0.3 mm), mainly of olivine, and a few small chondrules (up to 0.6 mm), in an opaque to translucent matrix. Trace amounts of metal and troilite are present as widely dispersed minute grains. Microprobe analyses of the olivine show a wide composition range: Fa0-52, mean Fa11, with a strong peak at Fa0-1, characteristic for the chondrule olivine; isolated olivine grains show a wide range in composition. A few grains of clinoenstatite (Fs0-2) and one grain of diopside were analyzed. The meteorite is a C2 chondrite.

Data from:
  Table 2
  Line 525:
Origin or pseudonym:Main icefield
Mass (g):14
Weathering grade:Ae
Fayalite (mol%):0-52
Ferrosilite (mol%):0-2
Comments:81002 pairing group
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References: Published in Antarctic Meteorite Newsletter 6(1) (1983), 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° 39' 36"S, 159° 19' 40"E)
Note: the NHM and MetBase coordinates are 10.8 km apart

     This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)
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