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| Allan Hills A77259 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A77259 This is an OFFICIAL meteorite name. Abbreviation: ALHA77259 This meteorite may also be called Allan Hills 77259 (ALH 77259) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  294 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 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA77259 Location: Allan Hills Field No.: 77123008 Weight (gms): 294.0 Meteorite Type: H5 Chondrite
Physical Description: This appears to be a nearly complete specimen, with only a small portion of the T surface not intact. The fractured portion of the T surface is yellowish-brown and weathered with slight traces of inclusions discernible in the stone. The remaining surfaces are covered with remnant patches of dull black fusion crust over a reddish brown iron oxide stained weathered surface. Regmaglypts are present on the E/S surface. The stone was difficult to chip.
Petrographic Description: Brian Mason Chondritic structure is well-developed, chondrules ranging from 0.2-1.2 mm in diameter; a variety of types is present, the commonest being barred olivine, granular olivine and fine-grained pyroxene. The groundmass consists of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite. The section is partly rimmed with fusion crust. Brown limonitic staining pervades the section. Microprobe analyses show olivine (Fa18) and pyroxene (Fs15) of uniform composition. The meteorite is classified as an H5 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 210: |
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| References: | Published in Antarctic Meteorite Newsletter 3(1) (1980), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:
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Statistics: This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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| Revision history: |
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