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| Allan Hills 84100 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills 84100 This is an OFFICIAL meteorite name. Abbreviation: ALH 84100 Observed fall: No Year found: 1984 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  110.3 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 10209 approved meteorites (plus 18 unapproved names) classified as H5. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||
| Writeup |
Writeup from AMN 9(3):
Sample No.: ALH84100 Location: Allan Hills Weight (g): 110.3 Field No.: 2800 Dimensions (cm): 7.5 x 3.5 x 3 Meteorite Type: H5 Chondrite with clast
Macroscopic Description,: Roberta Score Weathered fusion crust covers 60% of this fragment. One striking feature of this stone is the heavily weathered fracture surface which contains a semi-rounded clast, 1.5 x 1.3 x 0.2 cm in dimension. This clast is white to light gray in color and coarse-grained. The interior is moderately weathered (heavy in areas), medium-gray in color, and contains numerous chondrules.
Thin Section (,4; ,5) Description: Brian Mason Portions of the clast in this H5 chondrite are present in two thin sections (84100,4 from 84100,1 and 84100,5 from 84100,2). The clast consists of granular olivine and pyroxene, with a little plagioclase and trace amounts of nickel-iron. Compositions of olivine (Fa18) and pyroxene (Fs16) are similar to those in the chondritic part of the meteorite; in addition, one grain of pigeonite (Wo9Fs15) was analysed. Two grains of plagioclase (An38, 50) were analysed. The olivine is turbid and shows undulose extinction (possible shock effects). | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 1065: |
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| References: | Published in Antarctic Meteorite Newsletter 9(3) (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 40719 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||
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