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| Allan Hills 82100 | |||||||||||||||||||||||||
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| 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:  24.3 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 626 approved meteorites classified as CM2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites | ||||||||||||||||||||||||
| Writeup |
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: |
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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:
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Statistics: This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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