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Allan Hills A77258 | |||||||||||||||||||||
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Basic information | Name: Allan Hills A77258 This is an OFFICIAL meteorite name. Abbreviation: ALHA77258 This meteorite may also be called Allan Hills 77258 (ALH 77258) in publications. Observed fall: No Year found: 1977 or 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: 597 g | ||||||||||||||||||||
Classification history: |
This is 1 of 6775 approved meteorites (plus 6 unapproved names) classified as H6. [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.: ALHA77258 Location: Allan Hills Field No.: B78010303 Weight (gms): 597.3 Meteorite Type: H6 Chondrite
Physical Description: This is a five sided specimen that is covered with polygonally fractured fusion crust. One small area has been stained by iron oxidation. The sample is ~10.0x9.0x5.0 cm. Sawing the sample in half reveals that the fusion crust is <0.5 mm thick and the sample has no weathering rind. Metallic particles are visible in the yellowish-brown matrix. The matrix material appears to be very porous.
Petrographic Description: Brian Mason In the section chondrules are sparse and poorly defined, merging with the granular groundmass, which consists of olivine and orthopyroxene with minor amounts of nickel-iron, troilite, and plagioclase. The section is moderately stained with brown limonite. Fusion crust is present along one edge. Microprobe analyses show olivine (Fa18), orthopyroxene (Fs16), and plagioclase (An13) of uniform composition; a little diopside (Wo47En47Fs6) occurs in association with orthopyroxene. The meteorite is classified as an H6 chondrite. | ||||||||||||||||||||
Data from: MB76 Table 2 Line 209: |
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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 44400 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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Revision history: |
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