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Allan Hills A79009
Basic information Name: Allan Hills A79009
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79009
This meteorite may also be called Allan Hills 79009 (ALH 79009) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 75.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 9655 approved meteorites (plus 16 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 4(1):

Sample No.: ALHA79009

Location: Allan Hills

Field No.: 1152

Weight (gms): 75.7

Meteorite Type: H5 Chondrite

 

Physical Description: Roberta Score

Stone is totally covered with iridescent brown and dull black fusion crust. Most of the interior of the stone has been weathered to a deep reddish-brown color. Some white evaporite deposit was noted just under the fusion crust. Dimensions: 5 x 4 x 3 cm.

 

Petrographic Description: Brian Mason

Chondritic structure is moderately well developed, with chondrules ranging from 0.4-1.5 mm in diameter. The matrix consists mainly of granular olivine and pyroxene, with minor amounts of nickel-iron and troilite. Weathering is extensive, with veins of limonite throughout the section. Fusion crust rims one edge of the section. Microprobe analyses show olivine (Fa18) and pyroxene (Fs15) of uniform composition. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 447:
Origin or pseudonym:Main icefield
Mass (g):75.7
Class:H5
Weathering grade:Ce
Fayalite (mol%):18
Ferrosilite (mol%):15
Comments:26Al=33±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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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Matteo Chinellato   
Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 42' 7"S, 159° 23' 40"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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