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Allan Hills 83016 | |||||||||||||||||||||||||
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Basic information | Name: Allan Hills 83016 This is an OFFICIAL meteorite name. Abbreviation: ALH 83016 Observed fall: No Year found: 1983 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 8(1):
Sample No.: ALH83016 Location: Allan Hills Weight (g): 4.1 Field No.: 2142 Dimensions (cm): 3 x 2 x 0.8 Meteorite Type: C2 Chondrite
Macroscopic Description: Roberta Score Fusion crust covers most of ALH83016. One surface is iridescent coppery-brown in color but other surfaces are dull black and polygonally fractured. The stone broke apart into centimeter-size (and smaller) pieces, leaving no original surfaces. The interior is black with abundant irregular shaped white inclusions and some chondrules.
Thin Section (,5) Description: Brian Mason The thin section shows a few poorly defined chondrules up to 1.8 mm across, consisting of granular or barred olivine with minor polysynthetically twinned clinopyroxene. The bulk of the meteorite consists of opaque to translucent brown to black matrix. Scattered through the matrix are colorless birefringent grains, mostly olivine, up to 0.3 mm but usually less than 0.1 mm across. Trace amounts of nickel-iron and sulfides are dispersed throughout the section as minute grains. Well-preserved fusion crust rims part of the section. Microprobe analyses show that both olivine and pyroxene vary in composition. Olivine ranges from Fa0.3 to Fa30, with a mean of Fa11; it has a notable chromium content, Cr2O3 ranging from 0.1 to 0.5 weight percent. Pyroxene is generally close to clinoenstatite in composition. The meteorite is a C2 chondrite. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 899: |
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References: | Published in Antarctic Meteorite Newsletter 8(1) (1985), 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) | ||||||||||||||||||||||||
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