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Allan Hills A79018
Basic information Name: Allan Hills A79018
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79018
This meteorite may also be called Allan Hills 79018 (ALH 79018) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 120.7 g
Classification
  history:
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 11000 approved meteorites (plus 6 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)
Writeuphelp
Writeup from AMN 4(1):

Sample No.: ALHA79018

Location: Allan Hills

Field No.: 1175

Weight (gms): 120.7

Meteorite Type: L6 Chondrite

 

Physical Description: Roberta Score

Thin brown and black patchy fusion crust covers all but one surface of this stone. This particular surface ranges in color from yellow to deep reddish-brown. Several inclusions are visible. The interior surfaces are mainly weathered with small areas of fresh material. Several black veins are apparent which may have been cracks that have oxidized severely. Several rounded inclusions up to 3 mm in diameter exist. Dimensions: 4.5 x 5.0 x 3.5 cm.

 

Petrographic Description: Brian Mason

Chondritic structure is barely discernible, the section showing a granular aggregate consisting largely of olivine and pyroxene, with minor amounts of maskelynite, nickel-iron, and troilite, and accessory chromite. An irregular enclave, 3.6 mm in maximum dimension, consists of fine-grained intergrown olivine and maskelynite. Veins, up to 0.3 mm thick, appear to contain ringwoodite and majorite. Fusion crust is present along one edge of the section; patches of limonite are present. Microprobe analyses gave the following compositions: olivine, Fa23 (Fa25 in the enclave); pyroxene, Fs20; the maskelynite has CaO content (2.2%) appropriate to oligoclase, but the Na2O is low and variable (Na2O= 1.0-3.8%). The meteorite is classified as an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 456:
Origin or pseudonym:Main icefield
Mass (g):120.7
Class:L6
Weathering grade:B/C
Fayalite (mol%):23
Ferrosilite (mol%):20
Comments:26Al=58±3
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° 23' 36"E)
Note: the NHM and MetBase coordinates are 7.2 km apart

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