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Allan Hills 83101
Basic information Name: Allan Hills 83101
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83101
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 639 g
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 12401 approved meteorites (plus 8 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 8(1):

Sample No.: ALH83101

Location: Allan Hills

Weight (g): 639.2

Field No.: 1471

Dimensions (cm): 9 x 8 x 5.5

Meteorite Type: L6 Chondrite


Macroscopic Description: Carol Schwarz

This smooth rounded specimen is covered with black, polygonally fractured fusion crust. One surface is flat and iridescent. There are several areas where fusion crust has weathered away revealing a rough reddish surface with areas of gray matrix visible. The interior is light gray and lightly dotted with oxidation. Metal flecks are numerous. The fusion crust is thick and tends to spall off.


Thin Section (,4) Description: Glenn MacPherson

Light limonitic stain is present locally, suggesting mild weathering. Chondrules up to 1.5 mm diameter are weakly preserved. A well developed polygonal-granular texture is present locally in the matrix, but the grain size is variable. Plagioclase (An12;Ab84;Or4) is abundant and coarse. Pyroxene (Fs23) is mostly orthorhombic. Olivine is uniformly Fa25. Metal (mostly one-phase) and troilite are subequal in amount. This meteorite is an L6 chondrite.

Data from:
  Table 2
  Line 959:
Origin or pseudonym:Far Western
Mass (g):639.2
Weathering grade:A
Fayalite (mol%):25
Ferrosilite (mol%):23
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References: Published in Antarctic Meteorite Newsletter 8(1) (1985), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 59' 7"S, 156° 52' 34"E)
Note: the NHM and MetBase coordinates are 77 km apart

     This is 1 of 43857 approved meteorites from Antarctica (plus 3802 unapproved names)
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