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Allan Hills A77280
Basic information Name: Allan Hills A77280
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77280
This meteorite may also be called Allan Hills 77280 (ALH 77280) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 3.23 kg
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(3)  (1978)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 10989 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 1(3):
This text was reprinted from AMN 1(3) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77280

Location: Allan Hills

Field No.: Y78010512

Weight (gms): 3226.0

Meteorite Type: L6 Chondrite

 

Physical Description:

Specimen is angular. Approximately 75% of the exterior surface is covered with a brownish-black fusion crust. In several places the fusion crust has spalled away revealing a heavily oxidized material. One face of the specimen is a broken surface, which is light gray and moderately iron oxide stained. The surface is irregular and has numerous linear fractures and a few 1-2 mm spherical inclusions. Approximate dimensions: 18.5x13.0x10.0 cm. When the specimen was removed from storage for initial processing, Antarctic snow was still present on the meteorite's exterior surface.

 

Petrographic Description: Brian Mason

This meteorite resembles ALHA77273 and 77277 closely, in structure, mineralogy, and composition of the olivine, orthopyroxene, and plagioclase. Weathering appears to be quite extensive, most of the section being stained brown by limonitic material.

Data from:
  MB76
  Table 2
  Line 230:
Origin or pseudonym:Main icefield
Mass (g):3226
Class:L6
Weathering grade:Be
Fayalite (mol%):24
Ferrosilite (mol%):21
Comments:26Al=44±2; 77272 pairing group
Catalogs:
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Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 1(3) (1978), 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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