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Allan Hills A77182
Basic information Name: Allan Hills A77182
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77182
This meteorite may also be called Allan Hills 77182 (ALH 77182) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 1135 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 10008 approved meteorites (plus 17 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.: ALHA77182

Location: Allan Hills

Field No.: Y78010313A

Weight (gms): 1134.7

Meteorite Type: H5 Chondrite

 

Physical Description:

No fusion crust is apparent on this angular specimen, 12.5x8.0x7.0 cm. The over all color of the sample is orangish-brown. A band, approximately 1.5 cm wide, o yellowish-green material crosses the meteorite on the E-W axis. It is apparent by looking at the T surface that this is not just a surface feature. Many random fractures cover the surface of the meteorite. Numerous irregular (lithic fragments and chondrules, up to as much as 0.5 cm in diameter, are apparent. This sample appears exfoliated. Surfaces revealed by sawing exhibited metallic particles, approximately 1-2 mm it diameter, in addition to chondrules and lithic fragments. The largest of these inclusions is approximately 0.5 mm in length. Three fractures, 3 cm in length, are apparent in the cut face. The meteorite has no weathering rind and no weathering along fractures.

 

Petrographic Description: Brian Mason

The thin section shows well-developed chondritic structure, with a variety of chondrule types; chondrule diameters range from 0.5-1.5 mm. The chondrules are set in a granular matrix consisting mainly of olivine and orthopyroxene, with minor amounts of nickel-iron and lesser amounts of troilite; many of the nickel iron grains are partly altered to red-brown limonite. Microprobe analyses show olivine (Fa19) and orthopyroxene (Fs17) of uniform composition; minor plagioclase (An12) was also identified. The meteorite is classed as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 146:
Origin or pseudonym:Main icefield
Mass (g):1134.7
Class:H5
Weathering grade:C
Fayalite (mol%):19
Ferrosilite (mol%):17
Comments:26Al=41±4
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 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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