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Allan Hills A77102
Basic information Name: Allan Hills A77102
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77102
This meteorite may also be called Allan Hills 77102 (ALH 77102) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 12.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  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 9648 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 4(1):

Sample No.: ALHA77102

Location: Allan Hills

Field No.: 77122767

Weight (gms): 12.25

Meteorite Type: H5 Chondrite

 

Physical Description:

Specimen is angular, highly weathered and dark brownish-black. Approximately 40% of the surface is the remnant of a fusion crust, the remaining surfaces are fracture surfaces. From field photographs it is apparent that the T surface was in contact with the ice. This is not a complete specimen. Its maximum dimension is approximately 2.5 cm. The interior of the meteorite appears very weathered after removing the thin section sample.

 

Petrographic Description: Brian Mason

Chondrules prominent and well-developed, ranging from 0.3-1.5 mm in diameter; a variety of types is present, including barred olivine, granular olivine, olivine pyroxene, and radiating pyroxene chondrules. The groundmass consists of granular olivine, pyroxene, nickel-iron, and troilite. Fusion crust is present along one edge. The section is pervaded by yellow-brown limonitic staining, and patches and veinlets of red-brown limonite are present, concentrated around grains of nickel-iron. Microprobe analyses show olivine (Fa19) and orthopyroxene (Fs15) of uniform composition; some small grains of sodic plagioclase were detected.

Data from:
  MB76
  Table 2
  Line 83:
Origin or pseudonym:Main icefield
Mass (g):12.3
Class:H5
Weathering grade:B
Fayalite (mol%):19
Ferrosilite (mol%):15
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 4(1) (1981), 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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