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Allan Hills A77150
Basic information Name: Allan Hills A77150
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77150
This meteorite may also be called Allan Hills 77150 (ALH 77150) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 58.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 1(2)  (1978)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
NIPR Catalogue:  2000 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 4(1):

Sample No.: ALHA77150

Location: Allan Hills

Field No.: 77123101

Weight (gms): 58.30

Meteorite Type: L6 Chondrite

 

Physical Description:

Maximum dimension of specimen is ~3.25 cm. Fusion crust covers the B and S surfaces, the remainder of the specimen is a fracture surface which is brownish-red. The fracture surface has a fine-grained, granular texture with some crystal faces apparent. The fissures on the fracture surface are iron oxide stained. When chipping, many very fine pieces fell off. The sample appears to be weathered throughout.

 

Petrographic Description: Brian Mason

Chondrules are sparse-and barely distinguishable from the granular groundmass, which consists of olivine, pyroxene, nickel-iron, and troilite. The section contains a fine-grained enclave, 1.5 mm across, consisting of olivine, pyroxene and numerous minute nickel-iron grains. Yellow-brown limonitic staining is pervasive throughout the meteorite. Microprobe analyses show olivine (Fa25) and orthopyroxene (Fs22) of uniform composition; medium-grained sodic plagioclase was also seen.

Data from:
  MB76
  Table 2
  Line 118:
Origin or pseudonym:Main icefield
Mass (g):58.3
Class:L6
Weathering grade:C
Fayalite (mol%):25
Ferrosilite (mol%):22
Comments:26Al=43±4
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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