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Allan Hills A79045
Basic information Name: Allan Hills A79045
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79045
This meteorite may also be called Allan Hills 79045 (ALH 79045) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 115.4 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.: ALHA79045

Location: Allan Hills

Field No.: 1177

Weight (gms): 115.4

Meteorite Type: L3 Chondrite

 

Physical Description: Roberta Score

A small patch of weathered fusion crust is visible on one surface. What may be remnant fusion crust on two surfaces is iridescent reddish-brown. The remaining three surfaces have weathered to a dull reddish-brown in color but the clastic nature of this meteorite is highly visible. One particular inclusion is 4 mm in diameter and yellow in color. The interior of the stone revealed through chipping is totally weathered. Dimension: 5.5 x 4.5 x 3 cm.

 

Petrographic Description: Brian Mason

The meteorite consists of a close-packed aggregate of chondrules (0.3-2.1 mm across) and irregular clasts (some of them chondrule fragments), with a relatively small amount of matrix material. Chondrule types include porphyritic and granular olivine and olivine-pyroxene, barred olivine, and fine-grained pyroxene. Some chondrules have black troilite-rich rims. Intergranular glass in chondrules may be transparent and pale brown, but is usually turbid and partly devitrified. Only a small amount of nickel-iron is present. Most of the pyroxene shows polysynthetic twinning. Brown limonitic staining pervades the section. Microprobe analyses show variable composition for both olivine and pyroxene: olivine, Fa2-38, average Fa23; pyroxene Fs2-29, average Fs8. The variability of olivine and pyroxene compositions indicates type 3, and the low metal content suggests L group, so the meteorite is tentatively classified as an L3 chondrite.

Data from:
  MB76
  Table 2
  Line 481:
Origin or pseudonym:Main icefield
Mass (g):115.4
Class:L3
Weathering grade:C
Fayalite (mol%):2-38
Ferrosilite (mol%):2-29
Comments:26Al=44±3; 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' 10"S, 159° 24' 5"E)
Note: the NHM and MetBase coordinates are 7 km apart

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