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Allan Hills A78252
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:help 2.79 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  Iron
AMN 3(2)  (1980)  IIIA
AMN 4(1)  (1981)  IVA
Meteoritical Bulletin:  MB 76  (1994)  IVA
NHM Catalogue:  5th Edition  (2000)  IVA
MetBase:  v. 7.1  (2006)  IVA
Recommended:  Iron, IVA    [explanation]

This is 1 of 70 approved meteorites (plus 1 unapproved name) classified as Iron, IVA.   [show all]
Search for other: IVA irons, Metal-rich meteorites, and Iron meteorites
Writeuphelp
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:
Origin or pseudonym:Main icefield
Mass (g):2789
Class:IVA
Catalogs:
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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:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

Statistics:
     This is 1 of 33406 approved meteorites from Antarctica (plus 6798 unapproved names)
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