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Allan Hills A77177
Basic information Name: Allan Hills A77177
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77177
This meteorite may also be called Allan Hills 77177 (ALH 77177) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 368 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
NIPR Catalogue:  2000 Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 10151 approved meteorites (plus 18 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 2(1):
This text was reprinted from AMN 2(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77177

Location: Allan Hills

Field No.: Y77123110

Weight (gms): 368.2

Meteorite Type: H5 Chondrite

 

Physical Description:

The sample is angular and is approximately 7.0x6.5x5.5 cm. This appears to be a whole specimen, with the exception of a 3.0x4.0 cm area, which has been chipped away. A dull, black fusion crust covers approximately 30 to 40 percent of the sample. The portion of the sample not covered with fusion crust is weathered reddish-brown. A yellowish-brown clast ~0.5 cm in diameter was observed on the W surface.

 

Petrographic Description: Brian Mason

The thin section shows well-developed chondritic structure, with a variety of chondrule types; chondrule diameters range from 0.3-1.8 mm. The chondrules are-set in a granular matrix consisting largely of olivine and orthopyroxene, pervaded with brown limonitic staining. Minor amounts of nickel-iron and troilite are present in the matrix, nickel-iron in considerably greater amount than troilite. Microprobe analyses show olivine (Fa18) and orthopyroxene (Fs16) of uniform composition; minor plagioclase (An13) and accessory whitlockite were also identified. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 142:
Origin or pseudonym:Main icefield
Mass (g):368.2
Class:H5
Weathering grade:C
Fayalite (mol%):18
Ferrosilite (mol%):16
Comments:26Al=54±3
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 2(1) (1979), 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 40719 approved meteorites from Antarctica (plus 4494 unapproved names)
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