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Allan Hills 83102
Basic information Name: Allan Hills 83102
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83102
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1786 g
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  C2
AMN 17(1)  (1994)  CM2
Meteoritical Bulletin:  MB 76  (1994)  CM2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Recommended:  CM2    [explanation]

This is 1 of 622 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeup from AMN 8(1):

Sample No.: ALH83102

Location: Allan Hills

Weight (g): 1240.8 (2 pieces)

Field No.: 2123

Dimensions (cm): 12 x 9 x 9 and 7.5 x 7.5 x 5

Meteorite Type: C2 Chondrite


Macroscopic Description: Roberta Score

ALH83102 consists of 20 or more pieces--only two of the larger pieces have been examined to date. Both pieces are extensively fractured and extremely friable. A small area of fusion crust is present. White evaporite deposit is present on both interior and exterior surfaces. Matrix ranges in color from greenish-black to black and contains small white inclusions. Areas of heavy oxidation were noted.


Thin Section (,25 and ,26) Description: Glenn MacPherson

These two meteorite fragments are identical and probably paired. The specimens are intensely altered: matrix, inclusions and chondrules are almost completely replaced by iron-rich phyllosilicates, calcite, and iron oxides. The matrix is opaque and black except where the sections are unusually thin. Olivine grains are sporadically preserved, and are mostly Fa0-2, although some range down to Fa42. One small spinel-rich refractory spherule was found, in which the spinel is nearly pure MgAl2O4. No other primary phases were found in this spherule. These meteorites are probably fragments of one C2 carbonaceous chondrite. They are probably paired with ALH83100.

Data from:
  Table 2
  Line 960:
Origin or pseudonym:Far Western
Mass (g):1786.2
Weathering grade:B/Ce
Fayalite (mol%):0-2
Comments:26Al=11±1; 83100 pairing group
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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::   (77° 2' 30"S, 157° 9' 16"E)
Note: the NHM and MetBase coordinates are 73.3 km apart

     This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)
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