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Allan Hills 84190
Basic information Name: Allan Hills 84190
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84190
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 7.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(1)  (1988)  Achondrite-unique
AMN 17(1)  (1994)  Acapulco-like
Meteoritical Bulletin:  MB 76  (1994)  Acapulcoite
NHM Catalogue:  5th Edition  (2000)  Acapulcoite
MetBase:  v. 7.1  (2006)  Acapulcoite
Recommended:  Acapulcoite    [explanation]

This is 1 of 77 approved meteorites classified as Acapulcoite.   [show all]
Search for other: Acapulcoite-lodranite family, Acapulcoites, and Primitive achondrites
Writeuphelp
Writeup from AMN 11(1):

Sample No.: ALH84190

Location: Allan Hills

Weight (g): 7.9

Field No.: 2490

Dimensions (cm): 3x1.5x1

Meteorite Type: Achondrite (unique)

 

Macroscopic Description: Roberta Score

This specimen probably fits on a corner of a larger meteorite that is angular and has an ablation flange. The interior material is extensively weathered; any features present are disguised by oxidation.

 

Thin Section (,2) Description: Brian Mason

The section shows an aggregate of anhedral to subhedral grains, 0.06-0.5 mm across, of olivine and pyroxene, with about 15% of disseminated nickel-iron and minor amounts of plagioclase and troilite. The proportion of pyroxene to olivine is estimated as 4:1. Weathering is extensive, with veinlets and small areas of brown limonite throughout the section. Microprobe analyses give the following compositions: olivine, Fa4; plagioclase, An19; pyroxene, Wo3Fs6 (slightly variable) with one grain of diopside, Wo43Fs3, analysed. The meteorite is essentially identical with ALHA81187, which was considered to be an unique achondrite; in mineral compositions and texture these meteorites closely resemble inclusions in iron meteorites, such as in Campo del Cielo (Wlotzka and Jarosewich, Smithsonian Contrib. Earth Sci., No. 19, p. 104, 1977).

Data from:
  MB76
  Table 2
  Line 1155:
Origin or pseudonym:Main icefield
Mass (g):7.9
Class:Acap
Weathering grade:C
Fayalite (mol%):4
Ferrosilite (mol%):6
Comments:81187 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 11(1) (1988), 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° 41' 1"S, 159° 20' 16"E)
Note: the NHM and MetBase coordinates are 9.2 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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