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Allan Hills 84188
Basic information Name: Allan Hills 84188
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84188
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 3.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  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 9(3):

Sample No..: ALH84188, 84206, 84250, 84254

Location: Allan Hills

Field Nos.: 2837; 2686; 2813; 1544

Weight (g): 3.1; 15.1; 10.0; 2.0

Dimensions (cm): 1x2x0.7; 2x2x1; 2x2x1; 1.5x1.5x0.4

Meteorite Type: E4 Chondrite

 

Macroscopic Description: Roberta Score,

All four specimens retain some fusion crust (84254 is totally covered with fusion crust). The interiors of 84206 and 84250 are black with inclusions as large as 2 mm in diameter, while the interiors of 84188 and 84254 are black and have a massive texture. Metal is present in 84206 and 84254. 84188 is extensively weathered; the others are minimally to moderately weathered.

 

Thin Section (ALH84188,2) Description: Brian Mason

Chondrules are relatively abundant, but are small, usually about 0.6 mm in diameter; they consist of fine-grained to coarsely granular pyroxene. 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. Micro-probe analyses show that most of the pyroxene is almost pure MgSiO3, but a few grains show FeO up to 2.7%. The nickel-iron contains 2.5% Si. The meteorite is an enstatite chondrite, and since some of the pyroxene is polysynthetically twinned clinoenstatite, it is classed E4. It closely resembles ALH81189, 82132, 84206, 84250, and 84254, and the possibility of pairing should be considered.

Data from:
  MB76
  Table 2
  Line 1153:
Origin or pseudonym:Near Western
Mass (g):3.1
Class:EH3
Weathering grade:C
Ferrosilite (mol%):0.7-3
Comments:81189 pairing group
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° 45' 10"S, 158° 46' 3"E)
Note: the NHM and MetBase coordinates are 23.4 km apart

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