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Allan Hills 85015
Basic information Name: Allan Hills 85015
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 85015
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.2 g
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  Diogenite
Meteoritical Bulletin:  MB 76  (1994)  Diogenite
NHM Catalogue:  5th Edition  (2000)  Diogenite
MetBase:  v. 7.1  (2006)  Howardite
Recommended:  Diogenite    [explanation]

This is 1 of 505 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Writeup from AMN 9(3):

Sample No.: ALH85015

Location: Allan Hills

Weight (g): 3.2

Field No.: 2281

Dimensions (cm): 1 x 1 x 1 Meteorite Type: Diogenite


Macroscopic Description: Roberta Score

Fifty percent of ALH85015 is covered with black fusion crust that is shiny in some areas and dull in other areas. Part of the area devoid of fusion crust is highly polished. A weathering rind extends 2 mm into the interior of the stone. The interior is medium gray in color with white and dark colored clasts.


Thin Section (,2) Description: Brian Mason

The section consists almost entirely of orthopyroxene clasts, up to 3 mm across, in a groundmass of comminuted orthopyroxene, with accessory plagioclase and opaques, and traces of olivine. The pyroxene is fairly uniform in composition, Fs25, with CaO 0.8-1.5%, MnO 0.45-0.67%, Al2O3 0.32-0.66%, TiO2 0.05-0.17%. Plagioclase composition is An84-95. A grain of olivine, Fa39, was analysed. The meteorite is a diogenite.

Writeup from AMN 33(1):
ALH 85015 this is a small sample so limited sections are available. Only one shows eucritic material, so its classification as a diogenite stands.
Data from:
  Table 2
  Line 1244:
Origin or pseudonym:Far Western
Mass (g):3.2
Weathering grade:A
Fayalite (mol%):39
Ferrosilite (mol%):25
Search for specimens in the Smithsonian Institution collection (U.S.):   
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References: Published in Antarctic Meteorite Newsletter 33(1) (2010), JSC, Houston
Published in Antarctic Meteorite Newsletter 9(3) (1986), 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° 54' 32"S, 156° 31' 23"E)
Note: the NHM and MetBase coordinates are 82.9 km apart

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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