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Allan Hills 85005
Basic information Name: Allan Hills 85005
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 85005
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 18.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  C2
Meteoritical Bulletin:  MB 76  (1994)  C2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  CM2
Recommended:  CM2    [explanation]

This is 1 of 532 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeuphelp
Writeup from AMN 9(3):

Sample No.: ALH85005, 85007, 85008, 85009, 85013

Location: Allan Hills

Field Nos.: 2268; 2209; 2284; 2240; 2257

Weight (g): 18.9; 82.0; 32.1; 46.6; 130.4

Dimensions (cm): 4x2x3; 5x4x4; 3x3x3.5; 4.5x3x3; 6x5x3.5

Meteorite Type: C2 Chondrite

 

Macroscopic Description: René Martinez

ALH85013 is completely covered with fusion crust; ALH85005 and 85009 retain some weathered fusion crust. The others have no fusion crust and have a knobby appearance with inclusions protruding from the surface. The interiors appear relatively unweathered, black, fine-grained, and contain irregular white inclusions that are <0.5 mm in longest dimension.

 

Thin Section (ALH85005,4) Description: Brian Mason

The section consists largely of black opaque matrix, through which are scattered small mineral grains (up to 0.2 mm) and sparse chondrules and chondrule fragments. The chondrules and most of the mineral grains consist of olivine, usually close to MgSiO4 in composition but with some more iron-rich. Pyroxene is less common, and is close to MgSiO3 in composition. A few grains of calcite were noted. The meteorite is a C2 chondrite; ALH85007, 85008, 85009, and 85013 are very similar and the possibility of pairing should be considered.

Data from:
  MB76
  Table 2
  Line 1234:
Origin or pseudonym:Far Western
Mass (g):18.9
Class:C2
Weathering grade:A
Fayalite (mol%):0.5-39
Ferrosilite (mol%):0.9-2.2
Comments:85005 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 9(3) (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° 58' 39"S, 156° 56' 9"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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