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| Allan Hills A78165 | |||||||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A78165 This is an OFFICIAL meteorite name. Abbreviation: ALHA78165 This meteorite may also be called Allan Hills 78165 (ALH 78165) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  20.9 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 396 approved meteorites classified as Eucrite-pmict. [show all] Search for other: Achondrites, Eucrites, and HED achondrites | ||||||||||||||||||||||||||||
| Writeup |
Writeup from AMN 2(2):
This text was reprinted from AMN 2(2) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA78165 Location: Allan Hills Field No.: 370 Weight (gms): 20.9 Meteorite Type: Polymict Eucrite
Physical Description: This is not a complete specimen (~3.5x3.0x1.5 cm). Shiny, black fusion crust covers only one surface. The other surfaces are fracture surfaces which have a medium gray matrix with <1 mm white clasts. A few of these clasts are weathered and yellow in color. When this stone was cleaved in half, a dark gray clast (~.5 cm) was exposed. This meteorite looks very similar in appearance to ALHA78158.
Petrographic Description: Brian Mason Most of the section is an ophitic intergrowth of plagioclase-pigeonite breccia, with clasts up to 0.3 mm across. Fusion crust rims a considerable part of the section. Microprobe analyses of the ophitic portion shows pigeonite of fairly uniform composition, averaging Wo11Fs53En36, with a little ferroaugite (Wo38Fs32En30), and plagioclase ranging An83-90, average An86. Pyroxene in the breccia is pigeonite ranging from Wo8Fs37En55 to Wo8FS61En31; one grain of ferroaugite, Wo44FS29En27, was analyzed. The meteorite is a polymict pyroxene-plagioclase achondrite. | ||||||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 382: |
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| References: | Published in Antarctic Meteorite Newsletter 2(2) (1979), 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 43857 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||||||
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