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Allan Hills 85159
Basic information Name: Allan Hills 85159
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 85159
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 11 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 10(2)  (1987)  E4
Meteoritical Bulletin:  MB 76  (1994)  EH3
NHM Catalogue:  5th Edition  (2000)  EH3
MetBase:  v. 7.1  (2006)  EH3
Recommended:  EH3    [explanation]

This is 1 of 137 approved meteorites classified as EH3.   [show all]
Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Writeuphelp
Writeup from AMN 10(2):

Sample No.: ALH85159

Location: Allan Hills

Weight (g): 11.0

Field No.: 2272

Dimensions (cm): 3 x 2.5 x 1

Meteorite Type: E4 Chondrite

 

Macroscopic Description: Roberta Score

The exterior is mostly covered with extremely weathered fusion crust. Chondrules are visible in the interior black matrix. Oxidation is moderate to heavy.

 

Thin Section (,3) Description: Brian Mason

Chondrules are relatively abundant, but are small, ranging up to 0.7 mm across; they consist of fine-grained to coarsely granular pyroxene (rare grains of olivine may be present) . The matrix consists largely of chondrule fragments and pyroxene grains, with a moderate amount of nickel-iron and sulfides. The meteorite is considerably weathered, with brown limonitic staining throughout the section. Microprobe analyses show pyroxene composition ranging from Fs0.3 to Fs1.8, with a mean of Fs0.9. The nickel-iron contains 2.2% Si. The meteorite is an enstatite chondrite, and since most of the pyroxene is polysynthetically twinned clinoenstatite, it is classed E4. It closely resembles ALH84254 and some other ALH E4 chondrites, and the possibility of pairing should be considered.

Data from:
  MB76
  Table 2
  Line 1387:
Origin or pseudonym:Far Western
Mass (g):11
Class:EH3
Weathering grade:B/C
Ferrosilite (mol%):0.3-1.8
Comments:81189 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 10(2) (1987), 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° 51' 22"S, 156° 19' 37"E)
Note: the NHM and MetBase coordinates are 86.6 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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