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Allan Hills A77274
Basic information Name: Allan Hills A77274
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77274
This meteorite may also be called Allan Hills 77274 (ALH 77274) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 288 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.: ALHA77274

Location: Allan Hills

Field No.: Y78010504

Weight (gms): 288.1

Meteorite Type: H5 Chondrite

 

Physical Description:

A small patch of dull black fusion crust remains on the B surface. The remaining surfaces are devoid of fusion crust and are weathered and stained reddish-brown by iron oxidation. One small fracture is present on the B surface. After sawing the interior of the sample revealed small metallic flecks, probably due to the abrasion of the saw blade against the metal included in the meteorite, as the remainder of the stone's sawed surface appeared a reddish-brown. Dimensions: 7.5x6.0x3.0 cm.

 

Petrographic Description: Brian Mason

Chondritic structure is well developed, but many of the chondrules have indistinct margins and tend to merge with the groundmass. Chondrules range up to 2.4 mm in diameter, the commonest types are granular olivine and fine-grained radiating pyroxene. The groundmass consists of olivine and pyroxene with minor amounts of nickel-iron and troilite. Brown limonitic staining pervades the section. Microprobe analyses show olivine (Fa18) and pyroxene (Fs16) of uniform composition. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 225:
Origin or pseudonym:Main icefield
Mass (g):288.1
Class:H5
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=53±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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