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| Allan Hills 85159 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills 85159 This is an OFFICIAL meteorite name. Abbreviation: ALH 85159 Observed fall: No Year found: 1985 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  11 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 142 approved meteorites classified as EH3. [show all] Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites | ||||||||||||||||||||
| Writeup |
Writeup from AMN 10(2):
Sample No.: ALH85159 Location: Allan Hills Weight (g): 11.0 Field No.: 2272 Dimensions (cm): 3 x 2.5 x 1 Meteorite Type: E4 Chondrite
Macroscopic Description: Roberta Score The exterior is mostly covered with extremely weathered fusion crust. Chondrules are visible in the interior black matrix. Oxidation is moderate to heavy.
Thin Section (,3) Description: Brian Mason Chondrules are relatively abundant, but are small, ranging up to 0.7 mm across; they consist of fine-grained to coarsely granular pyroxene (rare grains of olivine may be present) . The matrix consists largely of chondrule fragments and pyroxene grains, with a moderate amount of nickel-iron and sulfides. The meteorite is considerably weathered, with brown limonitic staining throughout the section. Microprobe analyses show pyroxene composition ranging from Fs0.3 to Fs1.8, with a mean of Fs0.9. The nickel-iron contains 2.2% Si. The meteorite is an enstatite chondrite, and since most of the pyroxene is polysynthetically twinned clinoenstatite, it is classed E4. It closely resembles ALH84254 and some other ALH E4 chondrites, and the possibility of pairing should be considered. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 1387: |
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| References: | Published in Antarctic Meteorite Newsletter 10(2) (1987), 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 44547 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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