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Allan Hills 84170
Basic information Name: Allan Hills 84170
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84170
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 39.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  E3
AMN 17(1)  (1994)  EH3
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.: ALH84170

Location: Allan Hills

Weight (g): 39.2

Field No.: 2535

Dimensions (cm): 3.5 x 3 x 2

Meteorite Type: E3 Chondrite

 

Macroscopic Description: Roberta Score

Fifty percent of this fragment is covered by extremely weathered brown fusion crust. The exposed interior has a black matrix with numerous white to gray rounded and irregular-shaped inclusions. ALH84170 is a coherent specimen.

 

Thin Section (,2) Description: Brian Mason

Chondrules are abundant, ranging from 0.3-2.0 mm across; they consist of radiating or granular pyroxene, some with olivine. The matrix is made up of chondrule fragments and mineral grains, with a considerable amount of opaque materials (nickel-iron and sulfides). Weathering is extensive, with brown limonitic staining throughout the section. Microprobe analyses show many grains of olivine and pyroxene close to Mg2SiO4 and MgSiO3 in composition, but some contain a considerable amount of iron. The nickel-iron contains 2.2-3.0% Si. The meteorite is an enstatite chondrite, and the unequilibrated compositions of the olivine and pyroxene suggest the E3 classification.

Data from:
  MB76
  Table 2
  Line 1135:
Origin or pseudonym:Near Western
Mass (g):39.2
Class:EH3
Weathering grade:B
Fayalite (mol%):0.6-28
Ferrosilite (mol%):0.9-17
Comments:26Al=69±5
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' 22"S, 158° 46' 51"E)
Note: the NHM and MetBase coordinates are 23.1 km apart

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