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Allan Hills 85001
Basic information Name: Allan Hills 85001
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 85001
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 212 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  Eucrite
AMN 17(1)  (1994)  Eucrite-Mg-rich
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-Mg-rich
NHM Catalogue:  5th Edition  (2000)  Eucrite-Mg rich
MetBase:  v. 7.1  (2006)  Eucrite-cm
Recommended:  Eucrite-Mg rich    [explanation]

This is 1 of 3 approved meteorites classified as Eucrite-Mg rich.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 9(3):

Sample No.: ALH85001

Location: Allan Hills

Weight (g): 212.3

Field No.: 2255

Dimensions (cm): 7 x 6 x 3.5

Meteorite Type: Eucrite

 

Macroscopic Description: Roberta Score

ALH85001 appears to be an oriented stone covered by a shiny black fusion crust with thick flow lines. Areas devoid of fusion crust have weathered to a brownish-gray color. A discontinuous weathering rind, as thick as 4 mm, was exposed when the stone was chipped. The interior is made up of abundant laths of chalky-looking plagioclase in a light gray matrix. The way this stone has weathered is more typical of the Elephant Moraine eucrites than those found in the Allan Hills.

 

Thin Section (,4) Description: Brian Mason

The section shows angular fragments of orthopyroxene and plagioclase, up to 2.4 mm across, in a comminuted groundmass of these minerals. Some of the pyroxene has lamellae and blebs of exsolved augite. One large gabbroic clast, 6 mm across with individual grains up to 3 mm, is present. Trace amounts of nickel-iron and troilite are present in the groundmass. Micro-probe analyses show that pyroxene compositions are remarkable uniform, Wo2Fs32, with a few more calcic grains, up to Wo8 (possibly incipient augite exsolution). Plagioclase composition is also fairly uniform, An92-94. The meteorite is a monomict eucrite with unusually magnesian pyroxene, similar to that in the Binda eucrite.

Data from:
  MB76
  Table 2
  Line 1230:
Origin or pseudonym:Far Western
Mass (g):212.3
Class:Eu "mg"
Weathering grade:A/B
Ferrosilite (mol%):32
Comments:NTL=0.10±0.01
Catalogs:
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References: 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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 50' 20"S, 156° 27' 8"E)
Note: the NHM and MetBase coordinates are 83.2 km apart

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