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Allan Hills A81003
Basic information Name: Allan Hills A81003
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81003
This meteorite may also be called Allan Hills 81003 (ALH 81003) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 10.1 g
Antarctic Meteorite Newsletter:  AMN 6(1)  (1983)  CV3
AMN 17(1)  (1994)  CV3-an
Meteoritical Bulletin:  MB 76  (1994)  CV3-an
NHM Catalogue:  5th Edition  (2000)  CV3
MetBase:  v. 7.1  (2006)  CV3-an
Recommended:  CV3-an    [explanation]

This is 1 of 6 approved meteorites classified as CV3-an.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Writeup from AMN 6(1):

Sample No.: ALHA81003

Location: Allan Hills

Field No.: 1228

Weight (gms): 10.1

Meteorite Type: C3V Carbonaceous Chondrite


Physical Description: Roberta Score

One small patch of fusion crust remains on this clastic carbonaceous chondrite. Abundant irregular shaped white inclusions dot the otherwise black surface. Few of the inclusions are oxidated. Metal was noted. Dimensions: 2.5 x 2.0 x 1.5 cm.


Petrographic Description: Brian Mason

The section shows numerous chondrules up to 3 mm across and irregular crystalline aggregates up to 2 mm in maximum dimension set in a minor amount of dark brown to black semi-opaque matrix. The chondrules and aggregates consist mainly of olivine with some polysynthetically twinned pyroxene. Trace amounts of nickel-iron are present as minute grains. Sulfide is present in minor amount, finely dispersed throughout the section. Microprobe analyses of chondrule's olivine show a wide composition range: Fa0-40, mean Fa8; the matrix consists largely of fine-grained iron-rich olivine, Fa40-60. Pyroxene in the chondrules is clinoenstatite, mostly near Fs1, but with occasional Fe-rich grains. The meteorite is classified as a C3V chondrite.

Data from:
  Table 2
  Line 526:
Origin or pseudonym:Main icefield
Mass (g):10.1
Class:CV3 an
Weathering grade:A/B
Fayalite (mol%):0-60
Ferrosilite (mol%):1
Comments:81003 pairing group
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References: Published in Antarctic Meteorite Newsletter 6(1) (1983), 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° 42' 21"S, 159° 15' 3"E)
Note: the NHM and MetBase coordinates are 10.7 km apart

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