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Allan Hills A78165
Basic information Name: Allan Hills A78165
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78165
This meteorite may also be called Allan Hills 78165 (ALH 78165) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 20.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(2)  (1979)  Eucrite or howardite
AMN 3(2)  (1980)  Eucrite-pmict
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-pmict
NHM Catalogue:  5th Edition  (2000)  Eucrite-pmict
NIPR Catalogue:  2000 Edition  (2000)  Eucrite-pmict
MetBase:  v. 7.1  (2006)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 341 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 2(2):
This text was reprinted from AMN 2(2) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA78165

Location: Allan Hills

Field No.: 370

Weight (gms): 20.9

Meteorite Type: Polymict Eucrite

 

Physical Description:

This is not a complete specimen (~3.5x3.0x1.5 cm). Shiny, black fusion crust covers only one surface. The other surfaces are fracture surfaces which have a medium gray matrix with <1 mm white clasts. A few of these clasts are weathered and yellow in color. When this stone was cleaved in half, a dark gray clast (~.5 cm) was exposed. This meteorite looks very similar in appearance to ALHA78158.

 

Petrographic Description: Brian Mason

Most of the section is an ophitic intergrowth of plagioclase-pigeonite breccia, with clasts up to 0.3 mm across. Fusion crust rims a considerable part of the section. Microprobe analyses of the ophitic portion shows pigeonite of fairly uniform composition, averaging Wo11Fs53En36, with a little ferroaugite (Wo38Fs32En30), and plagioclase ranging An83-90, average An86. Pyroxene in the breccia is pigeonite ranging from Wo8Fs37En55 to Wo8FS61En31; one grain of ferroaugite, Wo44FS29En27, was analyzed. The meteorite is a polymict pyroxene-plagioclase achondrite.

Data from:
  MB76
  Table 2
  Line 382:
Origin or pseudonym:Main icefield
Mass (g):20.9
Class:Eu "pm"
Weathering grade:A
Ferrosilite (mol%):37-61
Comments:26Al=104±; 76005 pairing group
Catalogs:
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Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 2(2) (1979), 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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