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Allan Hills A77269
Basic information Name: Allan Hills A77269
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77269
This meteorite may also be called Allan Hills 77269 (ALH 77269) in publications.

Observed fall: No
Year found: 1977 or 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 1045 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.: ALHA77269

Location: Allan Hills

Field No.: Y78010312

Weight (gms): 1045.0

Meteorite Type: L6 Chondrite

 

Physical Description:

Ice was observed on the meteorite when it was removed from the freezer. This specimen is pyramidal with well-defined edges. Three surfaces are smooth with remnants of brownish-black fusion crust. The other surface is rough on a centimeter scale and has patches of dull, black fusion crust, especially on the high portion of the surface and along the edges. This surface appears to have been broken late during entry and only partially developed a fusion crust. The smooth faces show small voids where it appears that inclusions have been removed. Small fissures are apparent on the surface. Small pieces of fresh metal appeared on the chipped surface. Dimensions approximately 10.5x10x8 cm.

 

Petrographic Description: Brian Mason

Chondrules are relatively sparse, with margins that tend to merge with the granular groundmass. Troilite and nickel-iron are present in minor approximately equal amounts. Limonitic staining pervades the section. Fusion crust, up to 1 mm thick, surrounds most of the section. Microprobe analyses show olivine (Fa24) and orthopyroxene (Fs22) of uniform composition.

Data from:
  MB76
  Table 2
  Line 220:
Origin or pseudonym:Main icefield
Mass (g):1045
Class:L6
Weathering grade:Be
Fayalite (mol%):24
Ferrosilite (mol%):22
Comments:26Al=49±3
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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