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Allan Hills A77191
Basic information Name: Allan Hills A77191
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77191
This meteorite may also be called Allan Hills 77191 (ALH 77191) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 642 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(1)  (1979)  L4
AMN 3(2)  (1980)  H5
AMN 4(1)  (1981)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
NIPR Catalogue:  2000 Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 5782 approved meteorites (plus 2 unapproved names) classified as H4.   [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.: ALHA77191

Location: Allan Hills

Field No.: 77122908

Weight (gms): 642.2

Meteorite Type: H4 Chondrite

 

Physical Description:

This 11.0x7.0x5.0 cm specimen is semi-rounded. However, the B surface is concave. This specimen is extremely weathered, making it difficult to determine the amount of fusion crust present. The W surface has a small area of thin, less than .5 mm thick, fusion crust. The iron oxide staining is semi-glossy and reddish-brown. Parallel fractures, in north-south direction, penetrate the stone. No unweathered material was exposed by cleaving the stone in half; the same reddish-brown oxidation staining that is present on the exterior of the stone penetrates throughout the specimen, with the exception of a few areas, approximately .5 cm in diameter, which are slightly lighter. This specimen is considered by Dr. Cassidy to be one of a group of nineteen samples that are likely to be related.

 

Petrographic Description: Brian Mason

The section shows well-developed chondritic structure, the chondrules ranging from 0.2-1.5 mm in diameter. One granular olivine chondrule on the edge of the section encloses a 0.6 mm elliptical inclusion of nickel-iron and troilite. The chondrules are set in a fine-grained granular matrix consisting largely of olivine and pyroxene, with minor nickel-iron and troilite (nickel-iron in excess: of troilite). Brown limonitic staining pervades the section. Microprobe analyses show olivine (Fa17) and pyroxene (Fs15) of uniform composition. The meteorite is classified as an H4 chondrite.

Data from:
  MB76
  Table 2
  Line 154:
Origin or pseudonym:Near Western
Mass (g):642.2
Class:H4
Weathering grade:C
Fayalite (mol%):16-18
Ferrosilite (mol%):14-16
Comments:26Al=56±4; NTL=34.5±0.3; 77004 pairing group
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 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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