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Allan Hills A78104 | |||||||||||||||||||||||||
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Basic information | Name: Allan Hills A78104 This is an OFFICIAL meteorite name. Abbreviation: ALHA78104 This meteorite may also be called Allan Hills 78104 (ALH 78104) 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 12222 approved meteorites (plus 7 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.: ALHA78104 Location: Allan Hills Field No.: 241 Weight (gms): 672.4 Meteorite Type: L6 Chondrite
Physical Description: The W surface of the meteorite is partially covered with black fusion crust, which is weathering away. The remainder of the specimen is rough on a centimeter scale, and is weathered and stained by iron-oxidation. A large clast, ~7 mm., is present on the N surface, and a smaller clast, ~3 mm., that appears metallic, is present on the T surface. A number of smaller clasts, which appear to be metallic, are scattered over the surface of the specimen. When the specimen was cleaved during processing, a light gray matrix with metal particles was exposed. An area ~l cm. x 3 cm. in the matrix is a darker gray. A weathering rind, ~5 mm. deep, occurs along some exterior margins.
Petrographic Description: Brian Mason Chondrules are sparse and have diffuse margins which tend to merge with the granular matrix, which consists of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite, some plagioclase, and accessory chromite. Minor limonitic staining is present around nickel-iron grains. Well-preserved fusion crust, 0.5 mm thick, is present along one edge. Microprobe analyses give the following compositions: olivine, Fa24; pyroxene, Fs20, plagioclase, An10 The meteorite is an L6 chondrite. ALHA78104 is an L6 chondrite similar to ALHA78103 in all respects. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 328: |
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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 43700 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
Proximity search: |