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| Allan Hills A77288 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A77288 This is an OFFICIAL meteorite name. Abbreviation: ALHA77288 This meteorite may also be called Allan Hills 77288 (ALH 77288) in publications. Observed fall: No Year found: 1977 or 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  1880 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 6825 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 1(3):
This text was reprinted from AMN 1(3) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA77288 Location: Allan Hills Field No.: Y78010602 Weight (gms): 1880.0 Meteorite Type: H6 Chondrite
Physical Description: The overall form of the specimen is angular. Four surfaces are rounded and smooth with a brown weathering rind and patches of dull black fusion crust ~1-2 mm thick. The other surfaces are fracture surfaces which also are covered with a brown weathering rind. Numerous fractures penetrate the stone. Inclusions are apparent on the severely weathered surfaces. Approximately 12.0x10.0x8.0 cm. No fresh metal or non-weathered surfaces observed in the process of obtaining material for thin sections or thermoluminescence studies. All surfaces exposed had a reddish-brown iron oxide staining.
Petrographic Description: Brian Mason Chondrules are sparse and poorly defined, tending to merge with the granular groundmass, which is made up largely of olivine and orthopyroxene, with minor amounts of nickel-iron (~15%), plagioclase (~10%), and troilite (~5%). Microprobe analyses show olivine (Fa19), orthopyroxene (Fs17), and plagioclase (An12) of essentially uniform composition. The meteorite is considerably weathered, with pervasive limonitic staining throughout the section. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 238: |
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| References: | Published in Antarctic Meteorite Newsletter 1(3) (1978), 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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