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Allan Hills A80104
Basic information Name: Allan Hills A80104
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA80104
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:help 882 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(2)  (1981)  Iron-ataxite
AMN 13(1)  (1990)  Iron-ataxite-ung
Meteoritical Bulletin:  MB 76  (1994)  Iron-ung
NHM Catalogue:  5th Edition  (2000)  Iron-ung
MetBase:  v. 7.1  (2006)  Iron-ung
Recommended:  Iron, ungrouped    [explanation]

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
Writeuphelp
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 Widmanst├Ątten 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.

Data from:
  MB76
  Table 2
  Line 495:
Origin or pseudonym:Main icefield
Mass (g):882
Class:Iron ung
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 4(2) (1981), 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' 42"S, 159° 17' 34"E)
Note: the NHM and MetBase coordinates are 9.7 km apart

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