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Allan Hills 84191
Basic information Name: Allan Hills 84191
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84191
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 14 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  C2
AMN 17(1)  (1994)  CM2
Meteoritical Bulletin:  MB 76  (1994)  CM2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Recommended:  CM2    [explanation]

This is 1 of 529 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeuphelp
Writeup from AMN 9(3):

Sample No.: ALH84191

Location: Allan Hills

Weight (g): 14.0

Field No.: 1451

Dimensions (cm): 3 x 2.5 x 1

Meteorite Type: C2 Chondrite

 

Macroscopic Description: Roberta Score

A fractured, blistered, black fusion crust entirely covers ALH84191. Chipping revealed an interior that is black with many rounded and irregular shaped inclusions. Oxidation is minor.

 

Thin Section (,2) Description: Brian Mason

The section shows scattered chondrules (up to 0.6 mm across), irregular aggregates, and mineral grains in a black matrix which contains dispersed metal and sulfide grains. There is little or no evidence of terrestrial weathering. Microprobe analyses show olivine as nearly pure Mg2SiO4 (FeO 0.4-1.3%) and pyroxene with somewhat greater variation (FeO 0.6-4.51; CaO 0.4-2.2%). The meteorite is a C2 chondrite, and closely resembles ALH84033 and other meteorites paired with it.

Data from:
  MB76
  Table 2
  Line 1156:
Origin or pseudonym:Middle Western
Mass (g):14
Class:CM2
Weathering grade:A
Fayalite (mol%):0.4-.8
Ferrosilite (mol%):0.8-7
Comments:81002 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° 49' 20"S, 158° 19' 40"E)
Note: the NHM and MetBase coordinates are 36.2 km apart

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