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| Allan Hills 83042 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills 83042 This is an OFFICIAL meteorite name. Abbreviation: ALH 83042 Observed fall: No Year found: 1983 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  0.5 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 43 approved meteorites classified as H3.6. [show all] Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||
| Writeup |
Writeup from AMN 10(2):
Sample No.: ALH83042 Location: Allan Hills Weight (g): 0.5 Field No.: 2125 Dimensions (cm): 1 x 0.5 x 0.5 Meteorite Type: H3 Chondrite
Macroscopic Description: René Martinez This tiny specimen consists mainly of fusion crust and a small amount of moderately weathered chondritic material.
Thin Section (,2) Description: Brian Mason The small section shows numerous chondrules, up to 0.7 mm across, in a finely granular groundmass which contains a moderate amount of nickel-iron and troilite. The chondrules consist mainly of granular olivine and olivine-pyroxene, with some of fine-grained radiating pyroxene. The section is stained yellow-brown with limonitic material, with small areas of red-brown limonite along one edge. Microprobe analyses show olivine ranging in composition from Fa7 to Fa33, with a mean of Fa20 (CV FeO is 31); pyroxene composition ranges from Fs2 to Fs15. The composition of the olivine and pyroxene and the amount of nickel-iron indicate H group, and the range of olivine composition type 3, hence the meteorite is classified as an H3 chondrite (estimated H3.6). | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 925: |
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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 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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| Revision history: |
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