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Allan Hills A77180
Basic information Name: Allan Hills A77180
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA77180
This meteorite may also be called Allan Hills 77180 (ALH 77180) in publications.

Observed fall: No
Year found: 1977
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 190.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  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 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA77180

Location: Allan Hills

Field No.: Y77123109

Weight (gms): 190.8

Meteorite Type: L6 Chondrite

 

Physical Description:

Remnant fusion crust remains on three surfaces of the sample. The other surfaces are fracture surfaces that are stained reddish-brown by iron oxidation. One fine grained gray inclusion, approximately 1 cm in diameter, was exposed in the sample during processing. The interior of the specimen is fine grained and light gray.

 

Petrographic Description: Brian Mason

Chondrules are sparse and poorly defined, tending to merge with the granular groundmass, which consists of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite. A little untwinned plagioclase is present. One edge of the section is bordered by remnants of fusion crust. A small amount of limonite is present, concentrated near the fusion crust. Microprobe analyses show olivine (Fa24), orthopyroxene (Fs20), and plagioclase (An10) of uniform composition; one grain of diopside (Wo48En46Fs6) was analyzed. The meteorite is classified as an L6 chondrite.

Data from:
  MB76
  Table 2
  Line 144:
Origin or pseudonym:Main icefield
Mass (g):190.8
Class:L6
Weathering grade:C
Fayalite (mol%):24
Ferrosilite (mol%):20
Comments:26Al=56±2
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(1) (1980), 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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