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Allan Hills 84120
Basic information Name: Allan Hills 84120
     This is an OFFICIAL meteorite name.
Abbreviation: ALH 84120
Observed fall: No
Year found: 1984
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 129 g
Antarctic Meteorite Newsletter:  AMN 10(1)  (1987)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3.8
NHM Catalogue:  5th Edition  (2000)  L3.8
MetBase:  v. 7.1  (2006)  L3.8
Recommended:  L3.8    [explanation]

This is 1 of 69 approved meteorites classified as L3.8.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeup from AMN 10(1):

Sample No.: ALH84120

Location: Allan Hills

Weight (g): 129.0

Field No.: 1545

Dimensions (cm): 4x4.5x3

Meteorite Type: L3 Chondrite


Macroscopic Description: Roberta Score

Thirty percent of ALH84120 is covered with fusion crust. Areas devoid of fusion crust have a brownish-gray color. The interior of this unequilibrated chondrite is medium-gray in color and contains numerous light and dark gray rounded and irregular shaped inclusions. Oxidation is light and mainly appears as haloes around metal grains.


Thin Section (,3) Description: Brian Mason

The section shows an aggregate of chondrules (0.3-1.8 mm across) and chondrule fragments in a fine-grained matrix of olivine and pyroxene with minor amounts of nickel-iron and troilite. A variety of chondrule types is present; a barred chondrule has transparent pale brown glass between the olivine bars. Most of the pyroxene is polysynthetically twinned clinobronzite. Minor weathering is indicated by brown limonitic staining around metal grains. Microprobe analyses show most olivine of fairly uniform composition, averaging Fa22, but with a few more magnesian grains (CV FeO is 8). Pyroxene composition is more variable, Fs6-21. The meteorite is classified as an L3 chondrite, probably L3.8-3.9.

Data from:
  Table 2
  Line 1085:
Origin or pseudonym:Far Western
Mass (g):129
Weathering grade:A/B
Fayalite (mol%):22
Ferrosilite (mol%):6-21
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References: Published in Antarctic Meteorite Newsletter 10(1) (1987), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 54' 18"S, 156° 56' 25"E)
Note: the NHM and MetBase coordinates are 72.6 km apart

     This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names)
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