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Allan Hills 83016
Basic information Name: Allan Hills 83016
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83016
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 4.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  C2
AMN 17(1)  (1994)  CM2
Meteoritical Bulletin:  MB 76  (1994)  CM2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Recommended:  CM2    [explanation]

This is 1 of 505 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 8(1):

Sample No.: ALH83016

Location: Allan Hills

Weight (g): 4.1

Field No.: 2142

Dimensions (cm): 3 x 2 x 0.8

Meteorite Type: C2 Chondrite

 

Macroscopic Description: Roberta Score

Fusion crust covers most of ALH83016. One surface is iridescent coppery-brown in color but other surfaces are dull black and polygonally fractured. The stone broke apart into centimeter-size (and smaller) pieces, leaving no original surfaces. The interior is black with abundant irregular shaped white inclusions and some chondrules.

 

Thin Section (,5) Description: Brian Mason

The thin section shows a few poorly defined chondrules up to 1.8 mm across, consisting of granular or barred olivine with minor polysynthetically twinned clinopyroxene. The bulk of the meteorite consists of opaque to translucent brown to black matrix. Scattered through the matrix are colorless birefringent grains, mostly olivine, up to 0.3 mm but usually less than 0.1 mm across. Trace amounts of nickel-iron and sulfides are dispersed throughout the section as minute grains. Well-preserved fusion crust rims part of the section. Microprobe analyses show that both olivine and pyroxene vary in composition. Olivine ranges from Fa0.3 to Fa30, with a mean of Fa11; it has a notable chromium content, Cr2O3 ranging from 0.1 to 0.5 weight percent. Pyroxene is generally close to clinoenstatite in composition. The meteorite is a C2 chondrite.

Data from:
  MB76
  Table 2
  Line 899:
Origin or pseudonym:Middle Western
Mass (g):4.1
Class:CM2
Weathering grade:A/B
Fayalite (mol%):0.3-30
Ferrosilite (mol%):0-1
Comments:81002 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° 49' 21"S, 158° 12' 22"E)
Note: the NHM and MetBase coordinates are 39.2 km apart

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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