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Allan Hills A79029
Basic information Name: Allan Hills A79029
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA79029
This meteorite may also be called Allan Hills 79029 (ALH 79029) in publications.

Observed fall: No
Year found: 1979
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 506 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.: ALHA79029

Location: Allan Hills

Field No.: 1099

Weight (gms): 505.5

Meteorite Type: H5 Chondrite

 

Physical Description: Carol Schwarz

Sample has very thin patchy fusion crust on four of six surfaces. Where the fusion crust has been worn away, the surfaces are dark reddish-brown in color. The entire meteorite has an iridescent sheen. Several large penetrating fractures are obvious. Chipping revealed a weathered reddish-brown interior. Only a small (5 mm2) area is less severely weathered. Dimensions: 10 x 7 x 4.5 cm.

 

Petrographic Description: Brian Mason

Chondritic structure is well-developed, with chondrules ranging from 0.3-1.5 mm in diameter. The chondrules are set in a granular groundmass of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Weathering is extensive, with brown limonite pervading the section. Microprobe analyses give olivine composition Fa18, orthopyroxene Fs16. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 467:
Origin or pseudonym:Main icefield
Mass (g):505.5
Class:H5
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=49±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° 43'S, 159° 40'E)

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