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Allan Hills 84086
Basic information Name: Allan Hills 84086
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84086
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 234 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 9(3)  (1986)  LL3
Meteoritical Bulletin:  MB 76  (1994)  LL3.8
NHM Catalogue:  5th Edition  (2000)  LL3.8
MetBase:  v. 7.1  (2006)  L3.8
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  L3.8
Recommended:  L3.8    [explanation]

This is 1 of 68 approved meteorites classified as L3.8.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 9(3):

Sample No.: ALH84086

Location: Allan Hills

Weight (g): 234.0

Field No.: 1569

Dimensions (cm): 9 x 5 x 3.5

Meteorite Type: LL3 Chondrite

 

Macroscopic Description: Roberta Score

Fusion crust covers most of this chondrite. Abundant inclusions, both chondrules and clasts, are contained in the medium gray-colored matrix. One light-colored clast visible on the exterior is 0.7 x 0.9 cm in dimension. Oxidation is minor.

 

Thin Section (,3) Description: Brian Mason

The section shows a close-packed aggregate of chondrules, chondrule fragments, and irregular inclusions up to 3 mm across, with a few grains of nickel-iron and sulfide and hardly any matrix. A considerable variety of chondrules is present, the commonest being porphyritic olivine and granular olivine with or without polysynthetically twinned clinopyroxene. Some chondrules have intergranular, transparent pale brown glass; in others the glass is turbid and partly devitrified. Microprobe analyses show a moderate range in the composition of olivine (Fa25-29), and a wider range in pyroxene (Fs17-26). This range in composition, and the presence of glass and twinned clinopyroxene, indicates type 3, and the olivine composition is characteristic of the LL group; the meteorite is therefore classified as an LL3 chondrite.

Data from:
  MB76
  Table 2
  Line 1051:
Origin or pseudonym:Far Western
Mass (g):234
Class:LL3.8
Weathering grade:A/B
Fayalite (mol%):25-29
Ferrosilite (mol%):17-26
Comments:26Al=56±2
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::   (77° 2' 30"S, 157° 1' 21"E)
Note: the NHM and MetBase coordinates are 76.2 km apart

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