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| Allan Hills A81002 | |||||||||||||||||||||||||
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| 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:  14 g | ||||||||||||||||||||||||
| Classification history: |
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 |
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: MB76 Table 2 Line 525: |
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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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Geography:
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Statistics: This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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