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| Allan Hills A78107 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A78107 This is an OFFICIAL meteorite name. Abbreviation: ALHA78107 This meteorite may also be called Allan Hills 78107 (ALH 78107) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  198.4 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(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.: ALHA78107 Location: Allan Hills Field No.: 473 Weight (gms): 198.4 Meteorite Type: H5 Chondrite
Physical Description: The B, S, and portions of the E surfaces are covered with a thin, black polygonally fractured fusion crust, which is slightly stained by iron-oxidation. There are shallow regmaglypts present on the S surface. The remaining surfaces are fracture surfaces and are weathered and stained a reddish-brown. No unweathered material was exposed in the sample during processing.
Petrographic Description: Brian Mason Chondritic structure is well developed, chondrules ranging from 0.3-1.2 mm across; a variety of types is present, the commonest being granular olivine and olivine-pyroxene, barred olivine, and fine-grained pyroxene. The chondrules are set in a fine-grained aggregate of olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). Limonitic staining pervades the section, and occasional patches of red-brown limonite are seen. Microprobe analyses give the following compositions: olivine, Fa18; pyroxene, Fs17. The meteorite is classified as an H5 chondrite. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 331: |
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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 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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| Revision history: |
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