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Allan Hills A78053
Basic information Name: Allan Hills A78053
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78053
This meteorite may also be called Allan Hills 78053 (ALH 78053) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 179 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(2)  (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 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 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA78053

Location: Allan Hills

Field No.: 267

Weight (gms): 179.0

Meteorite Type: H4 Chondrite

 

physical Description:

This 8.0 x 6.0 x 2.5 cm specimen has a small amount of thin, shiny black fusion crust on the B face. The remainder of the sample is smooth, weathered and stained reddish-brown by iron-oxidation. Fractures are present on the T and B surfaces. No unweathered material was exposed in the meteorite during processing.

 

Petrographic Description: Brian Mason

Chondritic structure is well developed, with chondrules ranging from 0.3-1.1 mm across; the commonest types are porphyritic olivine (with turbid partly devitrified glass between the olivine crystals), granular olivine and olivine-pyroxene, and fine-grained pyroxene. The chondrules are set in a fine-grained granular groundmass of olivine and pyroxene, with minor amounts of nickel-iron and troilite. Some of the pyroxene is polysynthetically twinned clinobronzite. Brown limonitic staining pervades the section, and veinlets and patches of red-brown limonite are present. Microprobe analyses give the following compositions: olivine, Fa17; pyroxene, Fs16. The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 296:
Origin or pseudonym:Main icefield
Mass (g):179
Class:H4
Weathering grade:C
Fayalite (mol%):17
Ferrosilite (mol%):16
Comments:26Al=56±3
Catalogs:
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Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 3(2) (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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