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Allan Hills A79027
Basic information Name: Allan Hills A79027
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79027
This meteorite may also be called Allan Hills 79027 (ALH 79027) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 133.2 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.: ALHA79027

Location: Allan Hills

Field No.: 1156

Weight (gms): 133.2

Meteorite Type: L6 Chondrite

 

Physical Description: Roberta Score

This stone looks as though it may fit together with ALHA79018 to make one stone. Dull black fusion crust covers five surfaces. Patches of fusion crust exist on the fracture surface indicating that this stone broke during entry in the atmosphere. The fracture surface ranges from yellowish-green to red-brown in color. Many inclusions are visible, the largest is 4 mm in its longest dimension (which looks similar to a inclusion in ALHA79018). The interior is light gray in color with reddish-brown oxidation scattered throughout. A 2 mm thick weathering rind is visible. Dimensions: 5.5 x 4.5 x 3 cm.

 

Petrographic Description: Brian Mason

Chondrules are barely discernible, merging with the granular matrix which consist largely of olivine and pyroxene, with minor plagioclase, nickel-iron, and troilite. Fusion crust, up to 0.6 mm thick, rims part of the section. The meteorite is almost unweathered, with only traces of limonitic alteration around the nickel-iron grains. Microprobe analyses gave the following compositions: olivine, Fa24; pyroxene, Fs20; plagioclase, An10. The meteorite is classified as an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 465:
Origin or pseudonym:Main icefield
Mass (g):133.2
Class:L6
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):20
Comments:26Al=42±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° 41' 59"S, 159° 5' 56"E)
Note: the NHM and MetBase coordinates are 14.7 km apart

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