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Allan Hills A77014 | |||||||||||||||||||||||||
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Basic information | Name: Allan Hills A77014 This is an OFFICIAL meteorite name. Abbreviation: ALHA77014 This meteorite may also be called Allan Hills 77014 (ALH 77014) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: 309 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 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.: ALHA77014 Location: Allan Hills Field No.: 77122931 Weight (gms): 308.8 Meteorite Type: H5 Chondrite
Physical Description: No fusion crust is preserved on this tabular stone (9.0x6.0x2.5 cm). The exterior of the specimen is shiny, reddish-brown with lighter brownish-gold streaks randomly distributed over the surface. One fracture appears to penetrate the sample completely and numerous, smaller cracks are present, many of which are parallel, cover the exterior surfaces. This sample appears exfoliated. When the thin section sample was taken, no fresh metal was exposed on the stone.
Petrographic Description: Brian Mason Chondritic structure is prominent in the thin section, but the margins of some chondrules are indistinct and tend to merge with the granular matrix. Some barred olivine and porphyritic olivine chondrules have gray turbid interstitial material, probably devitrified glass. Minor minerals include nickel-iron and troilite. A moderate amount of brown limonitic staining pervades the section, and small patches of limonite surround some of the metal grains. Plagioclase is present as small untwinned grains difficult to recognize. Microprobe analyses give the composition of the olivine as Fa18, the orthopyroxene as Fs17, and the plagioclase as An12. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 22: |
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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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