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Allan Hills A77102 | |||||||||||||||||||||||||
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Basic information | Name: Allan Hills A77102 This is an OFFICIAL meteorite name. Abbreviation: ALHA77102 This meteorite may also be called Allan Hills 77102 (ALH 77102) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: 12.3 g | ||||||||||||||||||||||||
Classification history: |
This is 1 of 11505 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 4(1):
Sample No.: ALHA77102 Location: Allan Hills Field No.: 77122767 Weight (gms): 12.25 Meteorite Type: H5 Chondrite
Physical Description: Specimen is angular, highly weathered and dark brownish-black. Approximately 40% of the surface is the remnant of a fusion crust, the remaining surfaces are fracture surfaces. From field photographs it is apparent that the T surface was in contact with the ice. This is not a complete specimen. Its maximum dimension is approximately 2.5 cm. The interior of the meteorite appears very weathered after removing the thin section sample.
Petrographic Description: Brian Mason Chondrules prominent and well-developed, ranging from 0.3-1.5 mm in diameter; a variety of types is present, including barred olivine, granular olivine, olivine pyroxene, and radiating pyroxene chondrules. The groundmass consists of granular olivine, pyroxene, nickel-iron, and troilite. Fusion crust is present along one edge. The section is pervaded by yellow-brown limonitic staining, and patches and veinlets of red-brown limonite are present, concentrated around grains of nickel-iron. Microprobe analyses show olivine (Fa19) and orthopyroxene (Fs15) of uniform composition; some small grains of sodic plagioclase were detected. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 83: |
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Catalogs: |
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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: |
Statistics: This is 1 of 44400 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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Revision history: |
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