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Allan Hills 85005 | |||||||||||||||||||||||||
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Basic information | Name: Allan Hills 85005 This is an OFFICIAL meteorite name. Abbreviation: ALH 85005 Observed fall: No Year found: 1985 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: ![]() | ||||||||||||||||||||||||
Classification history: |
This is 1 of 615 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 9(3):
Sample No.: ALH85005, 85007, 85008, 85009, 85013 Location: Allan Hills Field Nos.: 2268; 2209; 2284; 2240; 2257 Weight (g): 18.9; 82.0; 32.1; 46.6; 130.4 Dimensions (cm): 4x2x3; 5x4x4; 3x3x3.5; 4.5x3x3; 6x5x3.5 Meteorite Type: C2 Chondrite
Macroscopic Description: René Martinez ALH85013 is completely covered with fusion crust; ALH85005 and 85009 retain some weathered fusion crust. The others have no fusion crust and have a knobby appearance with inclusions protruding from the surface. The interiors appear relatively unweathered, black, fine-grained, and contain irregular white inclusions that are <0.5 mm in longest dimension.
Thin Section (ALH85005,4) Description: Brian Mason The section consists largely of black opaque matrix, through which are scattered small mineral grains (up to 0.2 mm) and sparse chondrules and chondrule fragments. The chondrules and most of the mineral grains consist of olivine, usually close to MgSiO4 in composition but with some more iron-rich. Pyroxene is less common, and is close to MgSiO3 in composition. A few grains of calcite were noted. The meteorite is a C2 chondrite; ALH85007, 85008, 85009, and 85013 are very similar and the possibility of pairing should be considered. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 1234: |
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References: | Published in Antarctic Meteorite Newsletter 9(3) (1986), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:![]() |
Statistics: This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
Proximity search: |