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Allan Hills A77263
Basic information Name: Allan Hills A77263
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77263
This meteorite may also be called Allan Hills 77263 (ALH 77263) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 1669 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  Iron
AMN 3(2)  (1980)  Iron-Group I or Og
AMN 7(1)  (1984)  IA
Meteoritical Bulletin:  MB 76  (1994)  IA
NHM Catalogue:  5th Edition  (2000)  IAB
MetBase:  v. 7.1  (2006)  IAB-MG
Recommended:  Iron, IAB-MG    [explanation]

This is 1 of 85 approved meteorites classified as Iron, IAB-MG.   [show all]
Search for other: IAB complex 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.: ALHA77263

Location: Allan Hills

Field No.: Y78010304

Weight (gms): 1669.0

Meteorite Type: Iron - Group I or Og

Physical Description:

This orangish-brown, angular sample is approximately 15.0x5.5x8.0 cm. All surfaces have regmaglypts, however, the T surface has smaller regmaglypts, ~3 mm in diameter, than the other surfaces that have regmaglypts as much as 2.5 cm in diameter. From field photographs it was determined that the T surface was in contact with the ice at the time of recovery; this surface has a more metallic luster than the other surfaces.

 

Tentative Classification: Roy S. Clarke, Jr.

An area of approximately 20 cm2 of macroetched surface was examined. Kamacite band widths are in the 2 to 2.5 mm range with a length to width ratio of 2 to 4. Neumann bands are present, and along more than half of the rim of the slice kamacite has been converted to α2 by atmospheric ablation. Areas of recrystallized kamacite are unevenly distributed over the surface. Comb taenite/plessite areas and grain boundary taenite are present. Grain boundary schreibersite is present as is one 3x1.5 mm schreibersite. External weathering appears to have been moderately severe. This specimen is a coarse octahedrite, a typical Group I or Og meteorite.

Data from:
  MB76
  Table 2
  Line 214:
Origin or pseudonym:Main icefield
Mass (g):1669
Class:IA
Comments:76002 pairing group
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 33930 approved meteorites from Antarctica (plus 6798 unapproved names)
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