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| Allan Hills 83070 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills 83070 This is an OFFICIAL meteorite name. Abbreviation: ALH 83070 Observed fall: No Year found: 1983 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  216 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 2884 approved meteorites (plus 2 unapproved names) classified as LL6. [show all] Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||
| Writeup |
Writeup from AMN 9(1):
Sample No.: ALH83070 Location: Allan Hills Weight (g): 215.7 Field No.: 2745 Dimensions (cm): 6 x 4 x 4.5 Meteorite Type: LL6 Chondrite
Macroscopic Description: René Martinez Black fusion crust covers most of this meteorite, except for a fracture surface which has weathered to a pale yellow color with reddish-brown oxidation stains. Weathering has caused the more resistant clasts/chondrules to show relief on this exterior surface. Fresh interior matrix is light gray and fine-grained with no visible oxidation staining. A darker gray weathering rind, discontinuous and thin, was exposed when this specimen was chipped. No metal is visible.
Thin Section (,3) Description: Brian Mason Chondritic structure is barely discernible, the section showing a rather uniform granular aggregate of olivine and pyroxene, with minor amounts of plagioclase and sulfide, a little nickel-iron, and accessory chromite. Microprobe analyses gave the following compositions: olivine, Fa29; pyroxene, Fs23; plagioclase, An10. The meteorite is an LL6 chondrite. In texture and mineral compositions it resembles ALHA78153 and 81123 and the possibility of pairing should be considered. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 953: |
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| References: | Published in Antarctic Meteorite Newsletter 9(1) (1986), 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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