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| Allan Hills A77300 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A77300 This is an OFFICIAL meteorite name. Abbreviation: ALHA77300 This meteorite may also be called Allan Hills 77300 (ALH 77300) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  235 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 11568 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.: ALHA77300 Location: Allan Hills Field No.: 77123024 Weight (gms): 234.5 Meteorite Type: H5 Chondrite
Physical Description: The stone is 9.0x5.0x4.5 cm and oblong. Half the surface appears to have had fusion crust that has been mostly ablated, leaving only dull, brown remnant patches. Half the specimen has a rough fracture surface. The exterior is uniformly weathered a dark orangish-brown. When the sample was cleaved in half, no unweathered material was exposed. The severity of the weathering caused the sample to crumble into many pieces during handling for photography.
Petrographic Description: Brian Mason Chondritic structure is moderately well-developed, but chondrules tend to merge with the granular groundmass, which consists largely of olivine and orthopyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). The meteorite is extensively weathered, with veinlets and patches of limonite throughout. Microprobe analyses show olivine (Fa18) and orthopyroxene (Fs16) of uniform composition. The meteorite is classified as an H5 chondrite. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 249: |
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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:
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Statistics: This is 1 of 44547 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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| Revision history: |
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