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Allan Hills 83008
Basic information Name: Allan Hills 83008
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83008
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 272 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.4/3.7
NHM Catalogue:  5th Edition  (2000)  L3.4/3.7
MetBase:  v. 7.1  (2006)  L3.4-3.7
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  L3.4-3.7
Recommended:  L3.4-3.7    [explanation]

This is the only approved meteorite classified as L3.4-3.7.
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 9(1):

Sample No.: ALH83008

Location: Allan Hills

Weight (g): 272.0

Field No.: 2516

Dimensions (cm): 8.5 x 5 x 3

Meteorite Type: L3 Chondrite

 

Macroscopic Description: Carol Schwarz

Shiny black fusion crust with large (<1 cm) oxidation haloes covers nearly all of this specimen. The interior is dark in color and dotted with oxidization. Small (~1 mm) sized clasts/chondrules are barely discernible.

 

Thin Section (,3) Description: Brian Mason

The section shows a close-packed aggregate of chondrules, chondrule fragments, and irregular inclusions in a dark matrix which contains minor subequal amounts of nickel-iron and troilite. Chondrules range in size from 0.2-3 mm across, and show a variety of types, the commonest being porphyritic or granular olivine with or without polysynthetically twinned clinopyroxene. Considerable weathering is indicated by brown limonitic staining throughout the section. Microprobe analyses give the following compositions: olivine, Fa10-24, mean Fa17 (CV FeO 22); pyroxene, Fs5-24. The variability of olivine and pyroxene compositions indicates type 3, and the amount of nickel-iron suggests L group; hence the meteorite is tentatively classified as an L3 chondrite. It resembles ALHA78046.

Data from:
  MB76
  Table 2
  Line 891:
Origin or pseudonym:Main icefield
Mass (g):272
Class:L3.4/3.7
Weathering grade:B
Fayalite (mol%):10-24
Ferrosilite (mol%):5-24
Comments:26Al=38±2; 78046 pairing group
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° 41' 30"S, 159° 22' 23"E)
Note: the NHM and MetBase coordinates are 8 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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