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Allan Hills A79033
Basic information Name: Allan Hills A79033
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79033
This meteorite may also be called Allan Hills 79033 (ALH 79033) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 281 g
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 12206 approved meteorites (plus 7 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 4(1):

Sample No.: ALHA79033

Location: Allan Hills

Field No.: 1170

Weight (gms): 208.8

Meteorite Type: L6 Chondrite


Physical Description: Roberta Score

All except one surface (which is a fracture surface) are covered with dull black to brown fusion crust. The fracture surface has weathered to a reddish-brown color, but several millimeter size inclusions are apparent on this surface. A 1 mm to 5 mm thick weathering rind is visible in the interior of this meteorite. The material exposed through chipping is light-gray in color with darker gray colored inclusions and mottled with reddish-brown oxidation. Metal is apparent but most of it has oxidation haloes around them. Dimensions: 7.5 x 6.5 x 3.5 cm.


Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, their margins merging with the granular groundmass, which consists largely of olivine and pyroxene with minor amounts of plagioclase, nickel-iron, and troilite. Fusion crust up to 0.6 mm thick is present along one edge. There is a moderate degree of weathering, shown by limonitic staining around nickel-iron grains. Microprobe analyses show olivine (Fa24), pyroxene (Fs20), and plagioclase (An10) of uniform composition. The meteorite is classified as an L6 chondrite.

Data from:
  Table 2
  Line 470:
Origin or pseudonym:Main icefield
Mass (g):280.8
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):20
Comments:26Al=72±4; NTL=0.2±0.1
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References: Published in Antarctic Meteorite Newsletter 4(1) (1981), 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° 41' 57"S, 159° 21' 28"E)
Note: the NHM and MetBase coordinates are 8.2 km apart

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