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| Allan Hills A78128 | |||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A78128 This is an OFFICIAL meteorite name. Abbreviation: ALHA78128 This meteorite may also be called Allan Hills 78128 (ALH 78128) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  154.7 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 10209 approved meteorites (plus 18 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.: ALHA78128 Location: Allan Hills Field No.: 250 Weight (gms): 154.7 Meteorite Type: H5 Chondrite
Physical Description: The sample is completely devoid of fusion crust. It is weathered and stained a dark reddish-brown and is shiny in some areas. On the B surface the specimen has some small spots that are nearly black, while in other areas the weathering is not as severe and chondrules (max. diameter 2 mm.) can be detected. The sample is extensively fractured. Chipping revealed only a slight amount of material that was not severely weathered.
Petrographic Description: Brian Mason Chondritic structure moderately well developed, with chondrules ranging from 0.2-2.4 mm across; the commonest types are granular olivine, barred olivine, and fine-grained radiating pyroxene. The groundmass consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite. The meteorite is extensively weathered, with much of the nickel-iron altered to brown limonite. Microprobe analyses give the following compositions: olivine, Fa19; orthopyroxene, Fs17 ; plagioclase, An 10. The meteorite is classified as an H5 chondrite. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 351: |
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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 40719 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||||||
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