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| Allan Hills A81040 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A81040 This is an OFFICIAL meteorite name. Abbreviation: ALHA81040 This meteorite may also be called Allan Hills 81040 (ALH 81040) in publications. Observed fall: No Year found: 1981 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  194.5 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 2012 approved meteorites (plus 4 unapproved names) classified as L4. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||
| Writeup |
Writeup from AMN 6(1):
Sample No.: ALHA81040 Location: Allan Hills Field No.: 1571 Weight (gms): 194.5 Meteorite Type: L4 Chondrite
Physical Description: Roberta Score Dull black fusion crust covers approximately 3/4 of this rounded stone. Areas with no fusion crust have weathered to a deep reddish-brown. A small interior area of mostly weathered material with very dark matrix and some metal flecks was revealed by chipping. Dimensions: 5.5 x 5 x 5 cm.
Petrographic Description: Brian Mason The section shows numerous well-defined chondrules in a granular groundmass consisting largely of olivine and pyroxene with minor amounts of nickel-iron and troilite. Chondrule types include porphyritic olivine and olivine-pyroxene, and fine-grained radiating pyroxenes. Much of the pyroxene is polysynthetically twinned clinobronzite. Brown limonitic staining is extensive throughout the section. Microprobe analyses give the following compositions: olivine, Fa25; pyroxene, Fs21. The meteorite is classified as an L4 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 563: |
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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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