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| Allan Hills A79023 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A79023 This is an OFFICIAL meteorite name. Abbreviation: ALHA79023 This meteorite may also be called Allan Hills 79023 (ALH 79023) in publications. Observed fall: No Year found: 1979 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  68.1 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 6000 approved meteorites (plus 2 unapproved names) classified as H4. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||
| Writeup |
Writeup from AMN 4(1):
Sample No.: ALHA79023 Location: Allan Hills Field No.: 1157 Weight (gms): 68.1 Meteorite Type: H4 Chondrite
Physical Description: Roberta Score This flat sample has one small patch of weathered fusion crust. The rest of the stone is iridescent reddish-brown in color. Several cracks penetrate the interior. Upon chipping, the meteorite fell into many small pieces. 90% of the interior is weathered, 10% is medium gray in color with many inclusions and oxidation haloes scattered throughout. The chip for thin section was taken from the freshest material. Dimensions: 5 x 4 x 1.5 cm.
Petrographic Description: Brian Mason The section shows numerous chondrules and chondrule fragments, 0.2-1.8 mm across. They are set in a granular groundmass which consists largely of olivine and pyroxene with minor amounts of nickel-iron and troilite. Weathering is extensive, shown by limonitic stains and veining throughout the section. Microprobe analyses show olivine of essentially uniform composition (Fa17) and somewhat variable pyroxene (Fs14-17 , average Fs15). The meteorite is classified as an H4 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 461: |
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| References: | Published in Antarctic Meteorite Newsletter 4(1) (1981), 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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