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| Allan Hills 84006 | |||||||||||||||||||||||||||||
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| Basic information | Name: Allan Hills 84006 This is an OFFICIAL meteorite name. Abbreviation: ALH 84006 Observed fall: No Year found: 1984 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  16 kg | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 499 approved meteorites classified as H4/5. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||
| Writeup |
Writeup from AMN 8(2):
Sample No.: ALH84006 Location: Allan Hills Weight (g): 16000.0 Field No.: 2886 Dimensions (cm): 32 x 22 x 18 Meteorite Type: H4-5 Chondrite
Macroscopic Description: Carol Schwarz Fusion crust with reddish oxidation haloes completely covers this meteorite. Large deep fractures occur throughout and white salt deposit is present in patches. The interior is mostly weathered with small areas of grayish matrix still present.
Thin Section (,3) Description: Glenn MacPherson A pervasive iron-oxide staining indicates that this chondrite is moderately weathered. ALH84006 consists of highly fragmented and broken clasts, chondrules and crystals, none larger than approximately 1 mm in diameter. Chondrules are sharp, with well-preserved microcrystalline structure, but very few are round or unbroken. Olivine is mostly uniform in composition, Fa18, but a few grains as iron-rich as Fa23 were found. Pyroxene is commonly but not always monoclinic and is Fs17-18 in composition. Kamacite, troilite, and chromite are abundant, with minor taenite. Metal is much more abundant than the sulfide. Poorly crystalline and non-stoichiometric plagioclase was found, about An13-14, but no analyses free of iron or magnesium could be obtained. This meteorite differs from ALH84004 in having finer-grained metal and sulfide phases and lacking the shock veins of the latter. This is an H4/5 chondrite. | ||||||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 972: |
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| References: | Published in Antarctic Meteorite Newsletter 8(2) (1985), 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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