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Allan Hills 83108
Basic information Name: Allan Hills 83108
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83108
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1519 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(1)  (1986)  CO3
Meteoritical Bulletin:  MB 76  (1994)  CO3
NHM Catalogue:  5th Edition  (2000)  CO3.5
MetBase:  v. 7.1  (2006)  CO3.5
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  CO3.5
Recommended:  CO3.5    [explanation]

This is 1 of 12 approved meteorites classified as CO3.5.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Writeuphelp
Writeup from AMN 9(1):

Sample No.: ALH83108

Location: Allan Hills

Weight (g): 1519.4

Field No.: 2120

Dimensions (cm): 16 x 8 x 6

Meteorite Type: C3O Chondrite

 

Macroscopic Description: Carol Schwarz

Approximately 80% of this carbonaceous chondrite is covered with dull, polygonally fractured fusion crust. The exterior matrix exposed on areas devoid of fusion crust has weathered to a greenish-gray color. The interior is medium gray, contains minute metal flecks, and shows no appreciable weathering.

 

Thin Section (,4) Description: Brian Mason

The section shows numerous chondrules, chondrule fragments, and irregular mineral aggregates in a turbid brown matrix which contains minor subequal amounts of nickel-iron and sulfide. The chondrules are small and fairly uniform in size, 0.2-0.6 mm across. Most of the chondrules consist of granular or porphyritic olivine; pyroxene is rare. Microprobe analyses show olivine compositions ranging from Fa0.9 to Fa38, with a marked peak at the high-iron end; pyroxene compositions range from almost pure MgSiO3 to Wo5Fs16, with a mean of Wo2Fs6. The meteorite is a C3O chondrite. It resembles the other C3O chondrites from the Allan Hills (77003, 77029, 82101), and the possibility of pairing should be considered.

Data from:
  MB76
  Table 2
  Line 966:
Origin or pseudonym:Far Western
Mass (g):1519.4
Class:CO3
Weathering grade:A
Fayalite (mol%):0.9-38
Ferrosilite (mol%):1-17
Comments:77003 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::   (77° 2' 47"S, 157° 4' 38"E)
Note: the NHM and MetBase coordinates are 75.2 km apart

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