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Allan Hills A77268
Basic information Name: Allan Hills A77268
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77268
This meteorite may also be called Allan Hills 77268 (ALH 77268) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 272 g
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  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 10950 approved meteorites (plus 20 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)
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.: ALHA77268

Location: Allan Hills

Field No.: Y78010311

Weight (gms): 272.0

Meteorite Type: H5 Chondrite


Physical Description: -

This appears to be a complete specimen with dull black fusion crust on all surfaces. One small area of material with an iridescent sheen is present on the T surface. A large fracture penetrates the entire stone. No unweathered material was exposed in the meteorite during processing.


Petrographic Description: Brian Mason

Chondritic structure is well developed; chondrules range from 0.3-1.8 mm in diameter, some being broken or irregular in form. The usual types of chondrules are present, the commonest being granular and porphyritic olivine and fine-grained pyroxene. The groundmass consists of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite); it is extensively veined with red-brown limonite. Microprobe analyses show olivine (Fa18) and pyroxene (Fs16) of uniform composition. The meteorite is classified as an H5 chondrite.

Data from:
  Table 2
  Line 219:
Origin or pseudonym:Main icefield
Mass (g):272
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):16
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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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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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