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| Allan Hills 84005 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills 84005 This is an OFFICIAL meteorite name. Abbreviation: ALH 84005 Observed fall: No Year found: 1984 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  12 kg | ||||||||||||||||||||
| Classification history: |
This is 1 of 8501 approved meteorites (plus 4 unapproved names) classified as L5. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||
| Writeup |
Writeup from AMN 9(1):
Sample No.: ALH84005 Location: Allan Hills Weight (g): 12000 (approx.) Field No.: 2061 Dimensions (cm): 30 x 18 x 15 Meteorite Type: L5 Chondrite
Macroscopic Description: Carol Schwarz This chondrite is covered with smooth fusion crust which is polygonally fractured, dotted with oxidation haloes, and has a blistery texture in some areas. Areas devoid of fusion crust are grayish with oxidation scattered throughout. The interior is gray and shows minor oxidation.
Thin Section (,4) Description: Brian Mason Chondrules and chondrule fragments are fairly abundant, but their margins tend to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Minor weathering is indicated by rusty haloes around metal grains. Microprobe analyses give the following compositions: olivine, Fa21; pyroxene, Fs18. These compositions are intermediate between those characteristic of H and L groups; the amount of metal suggests L group, and the meteorite is tentatively classified as an L5 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 971: |
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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 43700 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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