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Allan Hills A78112 | |||||||||||||||||||||||||
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Basic information | Name: Allan Hills A78112 This is an OFFICIAL meteorite name. Abbreviation: ALHA78112 This meteorite may also be called Allan Hills 78112 (ALH 78112) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: ![]() | ||||||||||||||||||||||||
Classification history: |
This is 1 of 11485 approved meteorites (plus 6 unapproved names) classified as L6. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||
Writeup![]() |
Writeup from AMN 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA78112 Location: Allan Hills Field No.: 260 Weight (gms): 2485.0 Meteorite Type: L6 Chondrite
Physical Description: Snow and/or ice was present on the sample, ~14 x 13 x 13 cm., when it was removed from cold storage. The specimen is covered with a 0.5 mm to 1 mm. fusion crust on four surfaces. On one of these surfaces the fusion crust has weathered to a brown color, while on the other surfaces the fusion crust is black. The S surface is a fracture surface that is 80% weathered and stained by iron-oxidation. The unweathered material is yellowish and appears homogeneous. Three fractures are present on the sample, two of these appear to be shallow. Sawing the specimen during processing revealed a light gray matrix material with oxidation halos around most of the visible metallic grains. Two interior cracks exist, but with no preferential weathering along them. Clasts as much as 3 mm. in diameter are present.
Petrographic Description: Brian Mason Chondrules are sparse and ill-defined, their borders tending to merge with the granular groundmass, which consists mainly of olivine and pyroxene, with minor subequal amounts of nickel-iron and troilite, plagioclase, and accessory chromite. A moderate amount of limonitic staining is associated with the nickel-iron grains. Microprobe analyses give the following compositions: olivine, Fa25; pyroxene, Fs20; plagioclase, An10. The meteorite is an L6 chondrite. ALHA78114 is another L6 chondrite, similar to ALHA78112 in all respects. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 336: |
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Catalogs: |
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References: | Published in Antarctic Meteorite Newsletter 3(2) (1980), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:![]() |
Statistics: This is 1 of 40719 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||||||
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