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Allan Hills A77164
Basic information Name: Allan Hills A77164
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77164
This meteorite may also be called Allan Hills 77164 (ALH 77164) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 38.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(3)  (1978)  L3
Meteoritical Bulletin:  MB 76  (1994)  L3
NHM Catalogue:  5th Edition  (2000)  L3
NIPR Catalogue:  2000 Edition  (2000)  L3
MetBase:  v. 7.1  (2006)  L3.5
Recommended:  L3.5    [explanation]

This is 1 of 95 approved meteorites classified as L3.5.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
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.: ALHA77164

Location: Allan Hills

Field No.: 77123003

Weight (gms): 38.14

Meteorite Type: L3 Chondrite

 

Physical Description:

Specimen is angular. Approximately 75% of the exterior surface of the sample is a fracture surface. This surface is dark brown and has a patina, which is probably due to a combination of chemical weathering and wind erosion. Nearly 25% of the sample is covered by a dark brown, patchy, thin fusion crust. This is not a complete specimen. Its maximum length is ~3.0 cm. No fresh metal was observed when the meteorite was chipped for thin section preparation.

 

Petrographic Description: Brian Mason

.This specimen is similar in texture, mineral composition, and degree of weathering to ALHA77160, which suggests it may be another piece of the same meteorite.

Data from:
  MB76
  Table 2
  Line 131:
Origin or pseudonym:Main icefield
Mass (g):38.1
Class:L3
Weathering grade:C
Fayalite (mol%):6-39
Ferrosilite (mol%):3-41
Comments:26Al=44±5; 77011 pairing group
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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