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Allan Hills A77182 | |||||||||||||||||||||||||
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Basic information | Name: Allan Hills A77182 This is an OFFICIAL meteorite name. Abbreviation: ALHA77182 This meteorite may also be called Allan Hills 77182 (ALH 77182) in publications. Observed fall: No Year found: 1977 or 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: 1135 g | ||||||||||||||||||||||||
Classification history: |
This is 1 of 11567 approved meteorites (plus 23 unapproved names) classified as H5. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||
Writeup |
Writeup from AMN 2(1):
This text was reprinted from AMN 2(1) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA77182 Location: Allan Hills Field No.: Y78010313A Weight (gms): 1134.7 Meteorite Type: H5 Chondrite
Physical Description: No fusion crust is apparent on this angular specimen, 12.5x8.0x7.0 cm. The over all color of the sample is orangish-brown. A band, approximately 1.5 cm wide, o yellowish-green material crosses the meteorite on the E-W axis. It is apparent by looking at the T surface that this is not just a surface feature. Many random fractures cover the surface of the meteorite. Numerous irregular (lithic fragments and chondrules, up to as much as 0.5 cm in diameter, are apparent. This sample appears exfoliated. Surfaces revealed by sawing exhibited metallic particles, approximately 1-2 mm it diameter, in addition to chondrules and lithic fragments. The largest of these inclusions is approximately 0.5 mm in length. Three fractures, 3 cm in length, are apparent in the cut face. The meteorite has no weathering rind and no weathering along fractures.
Petrographic Description: Brian Mason The thin section shows well-developed chondritic structure, with a variety of chondrule types; chondrule diameters range from 0.5-1.5 mm. The chondrules are set in a granular matrix consisting mainly of olivine and orthopyroxene, with minor amounts of nickel-iron and lesser amounts of troilite; many of the nickel iron grains are partly altered to red-brown limonite. Microprobe analyses show olivine (Fa19) and orthopyroxene (Fs17) of uniform composition; minor plagioclase (An12) was also identified. The meteorite is classed as an H5 chondrite. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 146: |
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Catalogs: |
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References: | Published in Antarctic Meteorite Newsletter 2(1) (1979), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography: |
Statistics: This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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Revision history: |
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