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| Allan Hills A78108 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A78108 This is an OFFICIAL meteorite name. Abbreviation: ALHA78108 This meteorite may also be called Allan Hills 78108 (ALH 78108) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  172.5 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 11284 approved meteorites (plus 22 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(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA78108 Location: Allan Hills Field No.: 399 Weight (gms): 172.5 Meteorite Type: H5 Chondrite
Physical Description: Only the T and N surfaces of the specimen (6.0 x 5.5 x 4.0 cm) have remnant patches of fusion crust. The other surfaces of the specimen are fracture surfaces that have been weathered and stained by iron-oxidation. Several fractures are apparent on the exterior of the sample. This sample appears to be severely shocked. During chipping many slickenside surfaces were exposed. The sample is brecciated and two veins of black material (~1 mm wide) with higher relief that the surrounding material, are present in the interior of the stone.
Petrographic Description: Brian Mason Chondritic structure is well developed, with chondrules ranging from 0.3-0.9 mm across. The chondrules are set in a fine-grained matrix which consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). Brown limonitic staining is present around the metal grains Microprobe analyses give the following compositions: olivine, Fa18; orthopyroxene, Fs16; plagioclase, An 12. The meteorite is classified as an H5 chondrite. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 332: |
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| References: | Published in Antarctic Meteorite Newsletter 3(2) (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 44048 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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