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Allan Hills A79007
Basic information Name: Allan Hills A79007
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79007
This meteorite may also be called Allan Hills 79007 (ALH 79007) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 142.3 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.: ALHA79007

Location: Allan Hills

Field No.: 1176

Weight (gms): 142.3

Meteorite Type: L6 Chondrite

 

Physical Description: Roberta Score

Dull black fusion crust covers 50% of this stone. Areas devoid of fusion crust range in color from light gray to yellowish-brown. Many clasts are visible, one in particular is 1.0 x 0.6 cm in diameter, greenish-yellow in color and very fined grained. The interior is relatively fresh. A small weathering rind is visible in some areas and small bits of oxidation are scattered throughout the light gray colored matrix. Dimensions: 6 x 4 x 4 cm.

 

Petrographic Description: Brian Mason

Chondrules are sparse and poorly developed; maximum diameter is 2.4 mm. Major minerals are olivine (Fa23) and orthopyroxene (Fs19); minor constituents are plagioclase (An10), nickel-iron, and troilite. A slight amount of weathering is indicated by limonitic staining around some of the nickel-iron grains. The meteorite is classified as an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 445:
Origin or pseudonym:Main icefield
Mass (g):142.3
Class:L6
Weathering grade:A/B
Fayalite (mol%):23
Ferrosilite (mol%):19
Comments:26Al=71±4; NTL=27.6±0.1
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' 52"S, 159° 20' 46"E)
Note: the NHM and MetBase coordinates are 8.5 km apart

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