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Allan Hills 85010
Basic information Name: Allan Hills 85010
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 85010
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.2 g
Antarctic Meteorite Newsletter:  AMN 10(1)  (1987)  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 626 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 10(1):

Sample No.: ALH85010, 85011, 85012

Location: Allan Hills

Field Nos.: 2294; 2653; 2221

Weight (g): 3.2; 10.7; 3.9

Dimensions (cm): 2x1x0.5; 2.5x2.5x3; many small pieces

Meteorite Type: C2 Chondrite


Macroscopic Description: René Martinez

Thick fusion crust is present on some of these carbonaceous chondrite fragments and not on others. All specimens have small (<1 mm) white rounded and irregular inclusions set in a fine-grained black matrix. Each fragment of ALH85012 has small amounts of evaporite deposit present. Visible oxidation is minor.


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 Mg2SiO4 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; ALH85010, 85011, and 85012 as well as ALH85007, 85008, 85009, and 85013 are very similar to ALH85005 and the possibility of pairing should be considered.

Data from:
  Table 2
  Line 1239:
Origin or pseudonym:Far Western
Mass (g):3.2
Weathering grade:A/B
Fayalite (mol%):0.7-28
Ferrosilite (mol%):3-20
Comments:85005 pairing group
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References: Published in Antarctic Meteorite Newsletter 10(1) (1987), 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° 50' 11"S, 156° 8' 33"E)
Note: the NHM and MetBase coordinates are 91 km apart

     This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names)
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