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| Allan Hills A81020 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A81020 This is an OFFICIAL meteorite name. Abbreviation: ALHA81020 This meteorite may also be called Allan Hills 81020 (ALH 81020) in publications. Observed fall: No Year found: 1981 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  1353 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 10190 approved meteorites (plus 18 unapproved names) classified as H5. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||
| Writeup |
Writeup from AMN 6(1):
Sample No.: ALHA81020 Location: Allan Hills Field No.: 1492 Weight (gms): 1352.5 Meteorite Type: H5 Chondrite
Physical Description: Carol Schwarz ALHA81020 is almost totally covered by a thin, black, polygonally fractured fusion crust. White deposits have formed on one surface. The interior is light gray in color with numerous oxidation haloes. Some fresh metal is obvious. Small white clasts, 1-2 mm, occur in the matrix. Dimensions: 11 x 8 x 7 cm.
Petrographic Description: Brian Mason Chondrules are present, ranging up to 2.2 mm across, but most of the section shows a granular aggregate of olivine and pyroxene with minor amounts of nickel-iron and troilite. Weathering is moderate, being limited to brown limonitic staining around metal grains. A little fusion crust is present on one edge. Microprobe analyses give the following compositions: olivine, Fa19; orthopyroxene, Fs16. The meteorite is classified as an H5 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 543: |
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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 40719 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||
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