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Allan Hills 83007
Basic information Name: Allan Hills 83007
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83007
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 285 g
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  L3
AMN 13(1)  (1990)  LL3
Meteoritical Bulletin:  MB 76  (1994)  LL3.2/3.5
NHM Catalogue:  5th Edition  (2000)  LL3.2/3.5
MetBase:  v. 7.1  (2006)  LL3.4
Recommended:  LL3.4    [explanation]

This is 1 of 24 approved meteorites classified as LL3.4.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeup from AMN 9(1):

Sample No.: ALH83007

Location: Allan Hills

Weight (g): 285.0

Field No.: 2530

Dimensions (cm): 9.5 x 5.5 x 4

Meteorite Type: L3 Chondrite


Macroscopic Description: Carol Schwarz

Black to slightly brownish fusion crust covers this specimen. One to five sq. mm areas of fusion crust have spalled off revealing several white clasts. The interior has a dark matrix with 1-5 mm sized clasts/chondrules that are gray to yellowish in color and somewhat weathered. One large area (8 x 4 mm) is medium gray and fine grained. This specimen is very coherent.


Thin Section (,4) Description: Brian Mason

The thin section shows a close-packed aggregate of chondrules, chondrule fragments, and irregular inclusions up to 2.5 mm across in a small amount of black matrix. The matrix includes minor subequal amounts of nickel-iron and troilite. A considerable variety of chondrules is present, the most common being granular olivine with or without polysynthetically twinned clinopyroxene, porphyritic olivine, and fine-grained pyroxene. Some chondrules have intergranular, transparent, pale brown glass; in others the glass is turbid and partly devitrified. Microprobe analyses show a wide range in the composition of olivine (Fa0.5-43) and pyroxene (Fs3-37). This range of composition, together with the presence of glass and twinned clinopyroxene, indicates type 3, and the small amount of nickel-iron suggests L group; the meteorite is therefore tentatively classified as an L3 chondrite. It resembles closely ALHA79003. (Editor's note: ALHA79003 is presently classified as LL3.)

Data from:
  Table 2
  Line 890:
Origin or pseudonym:Main icefield
Mass (g):285
Weathering grade:B
Fayalite (mol%):0.5-43
Ferrosilite (mol%):3-37
Comments:26Al=58±2; 79003 pairing group
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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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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 46' 5"S, 159° 20' 22"E)
Note: the NHM and MetBase coordinates are 10.2 km apart

     This is 1 of 43352 approved meteorites from Antarctica (plus 3802 unapproved names)
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