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Allan Hills A77281
Basic information Name: Allan Hills A77281
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77281
This meteorite may also be called Allan Hills 77281 (ALH 77281) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 1231 g
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.: ALHA77281

Location: Allan Hills

Field No.: Y78010801

Weight (gms): 1231.0

Meteorite Type: L6 Chondrite

 

Physical Description:

is appears to Specimen be a complete specimen. A brownish-black fusion crust, with polygonal fractures, approximately 2 mm thick, covers nearly 90% of the meteorite's exterior surface. The B surface is in part void of fusion crust. Many inclusions (2-5 mm dia.) are present on this iron oxide stained surface. Fractures are present on the surface of the specimen and post-chipping observations revealed that weathering occurred along these fracture surfaces. The interior portion of the meteorite, away from fractures, is not weathered. Specimen's dimensions:  ~13.0x10.5x6.5 cm.

 

Petrographic Description: Brian Mason

This meteorite resembles ALHA77280 closely, in structure, mineralogy, composition of olivine, orthopyroxene, and plagioclase, and in degree of weathering. Fusion crust is present along one edge of the section.

Data from:
  MB76
  Table 2
  Line 231:
Origin or pseudonym:Main icefield
Mass (g):1231
Class:L6
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):20
Comments:26Al=42±2
Catalogs:
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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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