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Allan Hills A81258
Basic information Name: Allan Hills A81258
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA81258
This meteorite may also be called Allan Hills 81258 (ALH 81258) in publications.

Observed fall: No
Year found: 1981
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  CV3
Meteoritical Bulletin:  MB 76  (1994)  CV3
NHM Catalogue:  5th Edition  (2000)  CV3
MetBase:  v. 7.1  (2006)  CV3
Recommended:  CV3    [explanation]

This is 1 of 507 approved meteorites (plus 1 unapproved name) classified as CV3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites
Writeuphelp
Writeup from AMN 8(1):

Sample No.: ALHA81258

Location: Allan Hills

Weight (g): 1.1

Field No.: 1651

Dimensions (cm): 1 x 1 x 0.5

Meteorite Type: C3V Chondrite

 

Macroscopic Description: Roberta Score

The stone is mostly covered with a vesicular black fusion crust.

 

Thin-Section (,1) Description: Brian Mason

The section shows numerous chondrules up to 2 mm across and irregular crystalline aggregates, up to 3 mm in maximum dimension, set in a minor amount of dark brown to black, semi-opaque matrix. The chondrules and aggregates consist mainly of granular olivine with minor amounts of polysynthetically twinned pyroxene. Trace amounts of nickel-iron are present as minute grains. Sulfide is present in small amounts, finely dispersed throughout the matrix and sometimes concentrated in chondrule rims. Microprobe analyses of chondrule olivine show a wide compositional range: Fa0-28, mean Fa11. The matrix appears to consist 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 a C3V chondrite, very similar to ALHA81003; the possibility of pairing should be considered.

Data from:
  MB76
  Table 2
  Line 780:
Origin or pseudonym:Near Western
Mass (g):1.1
Class:CV3
Weathering grade:B
Fayalite (mol%):0-28
Ferrosilite (mol%):0-1
Comments:81003 pairing group
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 42' 37"S, 158° 46' 58"E)
Note: the NHM and MetBase coordinates are 22.7 km apart

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