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Allan Hills A77287
Basic information Name: Allan Hills A77287
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77287
This meteorite may also be called Allan Hills 77287 (ALH 77287) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 230 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.: ALHA77287

Location: Allan Hills

Field No.: Y78010503

Weight (gms): 230.1

Meteorite Type: H5 Chondrite

 

Physical Description:

Small patches of remnant fusion crust remain on the T and B surfaces of the specimen. The remaining surfaces are smooth and are weathered a reddish-brown. Small areas of the exterior surface have an iridescent sheen. No unweathered material was exposed during the processing of the sample.

 

Petrographic Description: Brian Mason

Chondritic structure not prominent, the chondrules tending to merge with the granular groundmass, which consists of olivine and pyroxene with minor amounts of nickel-iron and troilite. The section is extensively veined with brown limonite. Microprobe analyses show olivine (Fa18) and pyroxene (Fs16) of uniform composition; a little fine-grained plagioclase (An11) and one grain of merrillite were also identified. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 237:
Origin or pseudonym:Main icefield
Mass (g):230.1
Class:H5
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=57±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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