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Allan Hills A77232
Basic information Name: Allan Hills A77232
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77232
This meteorite may also be called Allan Hills 77232 (ALH 77232) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 6.49 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
NIPR Catalogue:  2000 Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 5779 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77232

Location: Allan Hills

Field No.: 77122905

Weight (gms) : 6494.3

Meteorite Type: H4 Chondrite

 

Physical Description:

The sample is rounded and only small patches of remnant fusion crust remain on the exterior surface. The sample is severely weathered, the entire specimen is uniformly stained reddish-brown, and fractured. When the sample was sawed it crumbled into many pieces. All of the surfaces exposed during processing were severely weathered. White deposits developed on some surfaces of the meteorite while they dried in the nitrogen cabinet. Dimensions: 20 x 19 x 14 cm.

 

Petrographic Description: Brian Mason

The section shows well-developed chondritic structure, the chondrules ranging from 0.4 to 1.2 mm in diameter. Chondrule types include porphyritic olivine, granular olivine and olivine-pyroxene, and fine-grained radiating pyroxene; in the porphyritic chondrules the olivine crystals are set in a turbid devitrified glass. Much of the pyroxene is polysynthetically twinned clinobronzite. The chondrules are in a fine-grained granular matrix consisting largely of olivine and pyroxene, with minor amount of nickel-iron (~15%) and troilite (~5%). The meteorite is considerably weathered, with limonite pervading the section and also concentrated in veinlets. Microprobe analyses show olivine (Fa17) and pyroxene (Fs15) of essentially uniform composition. The olivine and pyroxene composition and the presence of clinobronzite indicate that the meteorite can be classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 187:
Origin or pseudonym:Near Western
Mass (g):6494.3
Class:H4
Weathering grade:C
Fayalite (mol%):17
Ferrosilite (mol%):15
Comments:26Al=54±3; 77004 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(1) (1980), 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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