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| Allan Hills 85070 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills 85070 This is an OFFICIAL meteorite name. Abbreviation: ALH 85070 Observed fall: No Year found: 1985 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  12.9 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 62 approved meteorites classified as L3.6. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||
| Writeup |
Writeup from AMN 11(2):
Sample No.: ALH85070 Location: Allan Hills Weight (g): 12.9 Field No.: 2231 Dimensions (cm): 3 x 2.5 x 1.5 Meteorite Type: L3 Chondrite
Macroscopic Description: Roberta Score, Fusion crust covers about 75% of this stone. The interior is light-gray and has abundant inclusions. Oxidation is light.
Thin Section (,3) Description: Brian Mason The section shows abundant chondrules and chondrule fragments, up to 2 mm across, in a fine-grained matrix containing a few coarser grains of nickel-iron and troilite. A variety of chondrule types is present including granular and porphyritic olivine and olivine-pyroxene, barred olivine and crypto-crystalline pyroxene. Much of the pyroxene is polysynthetically twinned clinobronzite. Minor weathering is indicated by rusty halos around metal grains. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa4-25, mean Fa18 (CV FeO is 38) ; pyroxene, Fs1-29. The small amount of nickel-iron suggests L group, and the variability of olivine and pyroxene compositions type 3; hence the meteorite is classified as an L3 chondrite (estimated L3.6). | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 1299: |
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| References: | Published in Antarctic Meteorite Newsletter 11(2) (1988), 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 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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| Revision history: |
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