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Allan Hills 83014
Basic information Name: Allan Hills 83014
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 83014
Observed fall: No
Year found: 1983
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 8(1)  (1985)  Ureilite
Meteoritical Bulletin:  MB 76  (1994)  Ureilite
NHM Catalogue:  5th Edition  (2000)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 647 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeuphelp
Writeup from AMN 8(1):

Sample No.: ALH83014

Location: Allan Hills

Weight (g): 1.3

Field No.: 2136
Dimensions (cm): 1 x 0.5 x 0.5

Meteorite Type: Ureilite

 

Macroscopic Description: Roberta Score

Weathered fusion crust covers only one surface of this ureilite. Well-developed crystal faces are visible on all other surfaces. The overall color is reddish-brown.

 

Thin Section (,2) Description: Brian Mason

The thin section shows an aggregate of rounded to subhedral grains (0.6-3 mm across) of olivine with minor pyroxene. Small platy crystals of graphite are present in carbonaceous rims to the silicate grains. Trace amounts of troilite and nickel-iron are present, the latter largely altered to translucent brown limonite concentrated along grain boundaries. Microprobe analyses show olivine of uniform composition (Fa18) with notably high CaO (0.4%) and Cr2O3 (0.7%) contents; the pyroxene is a pigeonite of composition Wo8Fs15. This meteorite is a ureilite; it appears to be relatively unshocked compared to most ureilites.

Data from:
  MB76
  Table 2
  Line 897:
Origin or pseudonym:Middle Western
Mass (g):1.3
Class:Ur
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):15
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' 20"S, 158° 13' 56"E)
Note: the NHM and MetBase coordinates are 38.5 km apart

Statistics:
     This is 1 of 44048 approved meteorites from Antarctica (plus 3802 unapproved names)
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