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Allan Hills A79001
Basic information Name: Allan Hills A79001
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79001
This meteorite may also be called Allan Hills 79001 (ALH 79001) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 32.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3
NHM Catalogue:  5th Edition  (2000)  L3
MetBase:  v. 7.1  (2006)  L3.5
Recommended:  L3.5    [explanation]

This is 1 of 95 approved meteorites classified as L3.5.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 4(1):

Sample No.: ALHA79001

Location: Allan Hills

Field No.: 1171

Weight (gms): 32.31

Meteorite Type: L3 Chondrite (tentative)

 

Physical Description: Roberta Score

Five exterior surfaces have a dull reddish-brown color while the sixth surface has a iridescent reddish-brown color. Though the interior is extremely weathered, clasts are visible. ALHA79001 and ALHA79003 are probably the same meteorite. Dimensions: 4 x 3.5 x 1.5

 

Petrographic Description: Brian Mason

The polished thin section shows a closely packed aggregate of chondrules (0.2-2 mm in diameter) and irregular crystalline aggregates, set in a small amount of dark fine-grained matrix which includes minor subequal amounts of nickel-iron and troilite. A considerable variety of chondrules is present, the most common being granular olivine with or without polysynthetically twinned clinopyroxene, porphyritic olivine, and fine-grained pyroxene. Some chondrules have intergranular transparent pale brown glass, in others the glass is turbid and partly devitrified. Some weathering is indicated by the presence of a moderate amount of brown limonite as veins and patches. Microprobe analyses show a wide range in the composition of olivine (Fa6-39) and pyroxene (Fs2-31); the pyroxene is a low-calcium clinopyroxene (CaO = 0.2-1.8%). This range of composition, together with the presence of glass and twinned clinopyroxene, indicates type 3, and the small amount of nickel-iron suggests L group; the meteorite is therefore tentatively classed as an L3 chondrite.

Data from:
  MB76
  Table 2
  Line 439:
Origin or pseudonym:Main icefield
Mass (g):32.3
Class:L3
Weathering grade:C
Fayalite (mol%):6-39
Ferrosilite (mol%):2-31
Comments:26Al=44±9; 77011 pairing group
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 42' 11"S, 159° 23' 22"E)
Note: the NHM and MetBase coordinates are 7.3 km apart

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