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Allan Hills 82100
Basic information Name: Allan Hills 82100
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 82100
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 24.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(2)  (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 505 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeuphelp
Writeup from AMN 6(2):

Sample No.: ALHA82100

Location: Allan Hills

Field No.: 2999

Weight (gins): 24.3

Meteorite Type: C2 Carbonaceous Chondrite

 

Physical Description: Carol Schwarz

Patchy fusion crust occurs mainly on the bottom of this carbonaceous chondrite. Small sub-millimeter inclusions are visible on the exterior surfaces of the stone. There are no fractures. The north face has a rough texture from weathering. The interior is also black with a few very small inclusions. Dimensions: 3.5 x 3.5 x 2.5 cm

 

Petrographic Description: Brian Mason

The section shows numerous small colorless grains (up to 0.3 mm) and irregular aggregates (up to 0.6 mm), mainly of olivine, and sparse chondrules, in a black matrix, translucent brown in thinned areas. Trace amounts of nickel-iron and troilite are present as widely dispersed minute grains. Microprobe analyses show olivine compositions in the range Fa1-47, but most grains are low-iron and the mean is Fa5; pyroxene is very rare, two grains of clinoenstatite (Fs1-2 ) being analyzed. The meteorite is a C2 chondrite.

Data from:
  MB76
  Table 2
  Line 839:
Origin or pseudonym:Far Western
Mass (g):24.3
Class:CM2
Weathering grade:A
Fayalite (mol%):1-47
Ferrosilite (mol%):1-2
Comments:81002 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 6(2) (1983), 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' 37"S, 156° 56' 18"E)
Note: the NHM and MetBase coordinates are 75.2 km apart

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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