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Allan Hills A77259
Basic information Name: Allan Hills A77259
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77259
This meteorite may also be called Allan Hills 77259 (ALH 77259) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 294 g
Classification
  history:
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 9646 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 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.: ALHA77259

Location: Allan Hills

Field No.: 77123008

Weight (gms): 294.0

Meteorite Type: H5 Chondrite

 

Physical Description:

This appears to be a nearly complete specimen, with only a small portion of the T surface not intact. The fractured portion of the T surface is yellowish-brown and weathered with slight traces of inclusions discernible in the stone. The remaining surfaces are covered with remnant patches of dull black fusion crust over a reddish brown iron oxide stained weathered surface. Regmaglypts are present on the E/S surface. The stone was difficult to chip.

 

Petrographic Description: Brian Mason

Chondritic structure is well-developed, chondrules ranging from 0.2-1.2 mm in diameter; a variety of types is present, the commonest being barred olivine, granular olivine and fine-grained pyroxene. The groundmass consists of fine-grained olivine and pyroxene, with minor amounts of nickel-iron and troilite. The section is partly rimmed with fusion crust. Brown limonitic staining pervades the section. Microprobe analyses show olivine (Fa18) and pyroxene (Fs15) of uniform composition. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 210:
Origin or pseudonym:Main icefield
Mass (g):294
Class:H5
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):15
Comments:26Al=49±2
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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