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| Allan Hills A78252 | |||||||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A78252 This is an OFFICIAL meteorite name. Abbreviation: ALHA78252 This meteorite may also be called Allan Hills 78252 (ALH 78252) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  2.79 kg | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 69 approved meteorites (plus 1 unapproved name) classified as Iron, IVA. [show all] Search for other: IVA irons, Metal-rich meteorites, and Iron meteorites | ||||||||||||||||||||||||||||
| 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.: ALHA78252 Location: Allan Hills Field No.: 242 Weight (gms): 2789.0 Meteorite Type: Iron-Group III A
Physical Description: The T surface of the meteorite was in contact with the ice at the time it was recovered. The surface (T) is convex and very smooth, the B surface is semi-concave. The meteorite is metallic brownish-black, with many spots of oxidation staining that are reddish-brown. In the center of the B surface is a hole ~4 cm in diameter. Striations exist on the T surface probably due to ablation during entry, the striations in the E-W direction dominate.
Tentative Classification: Roy S. Clarke, Jr. An area of approximately 30 cm2 of macroetched surface was examined. Kamacite band widths are in the 0.5 mm range, with a length to width ratio ranging from 10 to 50. One edge of the slice has a continuous rim of α2 produced by atmospheric ablation. Neumann bands are present and the kamacite has a matte appearance. Some kamacite bands are mildly deformed. Kamacite grains are continuously bordered by taenite or taenite-plessite areas. Plessite areas cover perhaps 40% of the surface area. Several small troilites are present. External weathering is moderately severe. This specimen is a medium octahedrite (Om) of narrow band width, probably a Group III A meteorite. [Addendum to AMN 4(1)] ALHA78252 This specimen is a fine octahedrite, a Group IV A meteorite (R. S. Clarke, Jr.). | ||||||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 432: |
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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 31137 approved meteorites from Antarctica (plus 7823 unapproved names) | ||||||||||||||||||||||||||||
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