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Allan Hills A77233
Basic information Name: Allan Hills A77233
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77233
This meteorite may also be called Allan Hills 77233 (ALH 77233) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 4.09 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  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 5782 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 2(1):
This text was reprinted from AMN 2(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77233

Location: Allan Hills

Field No.: 77122913

Weight (gms): 4087.0

Meteorite Type: H4 Chondrite

 

Physical Description:

This stone is 15.0x14.0x10.5 cm. Thin, (<1 mm) dull, black, patchy fusion crust is present on the S and E surfaces. The remainder of the stone is shiny reddish-brown. White deposits, presumably evaporites, are present in minor cracks on all exterior surfaces.

 

Petrographic Description:

This section shows well-developed chondritic structure, the chondrules ranging from 0.2-2.8 mm in diameter; a variety of types is present, the commonest being porphyritic olivine, barred olivine, and fine-grained radiating pyroxene. The chondrules are set in a fine-grained granular groundmass consisting largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in greater amount than troilite). Some of the pyroxene is polysynthetically twinned clinobronzite. Limonitic staining pervades the section, and veinlets and grains of limonite are common, generally in association with nickel-iron. Microprobe analyses show somewhat variable composition in olivine (Fa14-21, average Fa17) and pyroxene (Fs15-17, average Fs16). The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 188:
Origin or pseudonym:Near Western
Mass (g):4087
Class:H4
Weathering grade:C
Fayalite (mol%):14-21
Ferrosilite (mol%):15-17
Comments:26Al=47±3; 77004 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 2(1) (1979), 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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