|Allan Hills A80104|
|Basic information||Name: Allan Hills A80104|
This is an OFFICIAL meteorite name.
This meteorite may also be called Allan Hills 80104 (ALH 80104) in publications.
Observed fall: No
Year found: 1980
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 882 g
This is 1 of 116 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped. [show all]
Search for other: Metal-rich meteorites, Ungrouped irons, and Iron meteorites
Writeup from AMN 4(2):
Sample No.: ALHA80104
Location: Allan Hills
Field No.: 1011
Weight (gms): 882.0
Meteorite Type: Ataxite
Physical Description,: Roy S. Clark, Jr.
This specimen is an irregularly shaped individual, 11 cm x 7 cm x 4 cm. One prominent rounded surface appears to have been ablation-shaped, and a second fairly large and comparatively smooth surface appears to have been the under side while the specimen was exposed at the surface of the ice. The meteorite is covered with a fairly uniform dark reddish brown iron oxide, and no fusion crust seems to remain. There are several deep linear incisions into the body of the meteorite that are possibly due to either preferential ablation or weathering of schreibersite inclusions exposed at the surface.
Tentative Classification: Roy S. Clarke, Jr.
A microetched surface area of approximately 7 cm2 was examined. A heat-altered zone is present over part of the external surface of the specimen. The metallographic matrix is a martensitic plessite. Kamacite spindles less than 0.1 mm wide, and generally less than ten times their width in length, are moderately uniformly distributed in a vague Widmanstätten pattern orientation. The kamacite spindles frequently enclose small schreibersites. Three large schreibersite areas enclosed in swathing kamacite as wide as 0.2 mm are present. The largest such area is 8 mm long. Weathering has penetrated 0.5 cm into the mass in one area. Chemical data and a more thorough metallographic examination will be required to classify this meteorite precisely.
|References:||Published in Antarctic Meteorite Newsletter 4(2) (1981), JSC, Houston|
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
This is 1 of 34687 approved meteorites from Antarctica (plus 6183 unapproved names)
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