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Allan Hills 84165
Basic information Name: Allan Hills 84165
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84165
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 94.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  Iron-octahedrite
AMN 13(1)  (1990)  IIIAB
Meteoritical Bulletin:  MB 76  (1994)  IIIAB
NHM Catalogue:  5th Edition  (2000)  IIIAB
MetBase:  v. 7.1  (2006)  IIIAB
Recommended:  Iron, IIIAB    [explanation]

This is 1 of 292 approved meteorites classified as Iron, IIIAB.   [show all]
Search for other: IIIAB irons, Metal-rich meteorites, and Iron meteorites
Writeuphelp
Writeup from AMN 9(1):

Sample No.: ALH84165

Location: Allan Hills

Weight (g): 94.7

Field No.: 2198

Dimensions (cm): 4.3 x 3.3 x 1.5

Meteorite Type: Octahedrite

 

Macroscopic Description: Roy S. Clarke, Jr.

This ablation-shaped individual is essentially oval in outline when viewed along its axis of oriented flight through the atmosphere. Over most of its area the anterior surface has a fairly uniform radius of curvature that is greater than the radius of curvature of the posterior surface. The anterior radius of curvature, however, does decrease markedly toward the edge, and the anterior surface extends beyond the joint of the two surfaces. The result is a 1 mm ablation lip or flange, reminiscent of a flanged australite. Both surfaces are covered with reddish brown secondary oxides, the anterior surface being smoother than the posterior. Delicate streamers of fusion crust remain, however, along the anterior surface edge. They record flow of melt away from the stagnation point and parallel to the direction of orientation during flight. A fine crack 1.5 cm long is present on the anterior surface.

 

Polished Section Description,: Roy S. Clarke, Jr.

A median section perpendicular to a flat projection of the anterior surface, and approximately parallel to and including the axis of orientation, provided an area of 3 sq. cm for examination. The anterior edge is free of fusion crust, but a structure in kamacite penetrates 1.5 to 2 mm. The posterior edge has a continuous fusion crust accumulation 0.2 to 0.3 mm thick. The kamacite along this edge has also been penetrated to a depth of 1.5 to 2 mm by α2 structure. At the flanges, fusion crust accumulation is as thick as 1.5 mm. Taenite lamellae, taenite-plessite areas, and cellular plessite areas are present. The few opportunities for band width measurements suggest a tentative value of about 1 mm. Grain boundary schreibersite is present as is schreibersite associated with taenite. Kamacite is mottled and contains a pronounced ε-structure and occasional remnant Neumann bands.

 

This ablation-shaped and shock-affected octahedrite may prove to be a Group III meteorite.

Data from:
  MB76
  Table 2
  Line 1130:
Origin or pseudonym:Main icefield
Mass (g):94.7
Class:IIIAB
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 9(1) (1986), 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' 36"S, 159° 9' 21"E)
Note: the NHM and MetBase coordinates are 13.1 km apart

Statistics:
     This is 1 of 33930 approved meteorites from Antarctica (plus 6798 unapproved names)
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