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Allan Hills 84120 | |||||||||||||||||||||
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Basic information | Name: Allan Hills 84120 This is an OFFICIAL meteorite name. Abbreviation: ALH 84120 Observed fall: No Year found: 1984 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: ![]() | ||||||||||||||||||||
Classification history: |
This is 1 of 69 approved meteorites classified as L3.8. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||
Writeup![]() |
Writeup from AMN 10(1):
Sample No.: ALH84120 Location: Allan Hills Weight (g): 129.0 Field No.: 1545 Dimensions (cm): 4x4.5x3 Meteorite Type: L3 Chondrite
Macroscopic Description: Roberta Score Thirty percent of ALH84120 is covered with fusion crust. Areas devoid of fusion crust have a brownish-gray color. The interior of this unequilibrated chondrite is medium-gray in color and contains numerous light and dark gray rounded and irregular shaped inclusions. Oxidation is light and mainly appears as haloes around metal grains.
Thin Section (,3) Description: Brian Mason The section shows an aggregate of chondrules (0.3-1.8 mm across) and chondrule fragments in a fine-grained matrix of olivine and pyroxene with minor amounts of nickel-iron and troilite. A variety of chondrule types is present; a barred chondrule has transparent pale brown glass between the olivine bars. Most of the pyroxene is polysynthetically twinned clinobronzite. Minor weathering is indicated by brown limonitic staining around metal grains. Microprobe analyses show most olivine of fairly uniform composition, averaging Fa22, but with a few more magnesian grains (CV FeO is 8). Pyroxene composition is more variable, Fs6-21. The meteorite is classified as an L3 chondrite, probably L3.8-3.9. | ||||||||||||||||||||
Data from: MB76 Table 2 Line 1085: |
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References: | Published in Antarctic Meteorite Newsletter 10(1) (1987), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:![]() |
Statistics: This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
Proximity search: |