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Allan Hills 85003
Basic information Name: Allan Hills 85003
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 85003
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 50.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 10(1)  (1987)  CO3
Meteoritical Bulletin:  MB 76  (1994)  CO3
NHM Catalogue:  5th Edition  (2000)  CO3.3
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 10(1):

Sample No.: ALH85003

Location: Allan Hills

Weight (g): 50.1

Field No.: 2259

Dimensions (cm): 4x3.5x2.5

Meteorite Type: C3O Chondrite

 

Macroscopic Description: René Martinez

Thick patchy fusion crust covers approximately 70% of this carbonaceous chondrite. The interior is light gray and chondrules/clasts are not distinguishable in the granular matrix. A 1 mm thick weathering rind and small patches of rust are present.

 

Thin Section (,4) Description: Brian Mason

The thin section shows an aggregate of small chondrules (up to 0.9 mm diameter, but most are less than 0.6 mm), chondrule fragments, and irregular aggregates set in a translucent yellow-brown matrix. Chondrules are mainly granular or porphyritic olivine. Minor amounts of nickel-iron and sulfide are present, as small grains scattered throughout the section. Microprobe analyses of olivine show a wide composition range, Fa1-56, mean Fa17; only a few grains of pyroxene were found, having a composition range of Fs0.5-23. The meteorite is classified as a C3 chondrite of the Ornans subtype; it is so similar to ALH82101 that the possibility of pairing should be considered.

Data from:
  MB76
  Table 2
  Line 1232:
Origin or pseudonym:Far Western
Mass (g):50.1
Class:CO3
Weathering grade:A/B
Fayalite (mol%):1-56
Ferrosilite (mol%):0.5-23
Comments:NTL=66±9; 82101 pairing group
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 54' 10"S, 156° 52' 12"E)
Note: the NHM and MetBase coordinates are 74.2 km apart

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