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Allan Hills A78132
Basic information Name: Allan Hills A78132
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78132
This meteorite may also be called Allan Hills 78132 (ALH 78132) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 656 g
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 400 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
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.: ALHA78132

Location: Allan Hills

Field No.: 406

Weight (gms): 656.0

Meteorite Type: Polymict Eucrite


Physical Description:

Snow/Ice was present on the sample when it was removed from cold storage. This appears to be a complete specimen (11x10x8 cm) with vitreous black fusion crust on all sides. The overall shape is pyramidal with the B surface being flat. The fusion crust on the T surface has flow bands, most prominent in the N-S direction and less prominent in the W-E direction. The B surface has radial flow lines in area that is concave. The fusion crust on the S surface is much duller than on the rest of the stone. The crust has been spalled or chipped in some areas, revealing a medium gray interior material. Small (<1 mm) inclusions, both lighter and darker than the matrix are apparent. Several holes (voids) that penetrate the fusion crust by as much as ~1 cm were noted over the entire stone. One in particular is ~9 mm in diameter and ~1 cm deep and contains a yellowish grain (?) ~2 mm long. The cut face shows a light gray matrix dotted with rounded and irregular shaped grains (?) that are both lighter and darker than the matrix. The largest grain is ~.5 cm in diameter. The voids that are present on the exterior of this specimen did not appear in the interior. A vein (?) of white grains extends for 6 cm across the cut face in the W-E direction.


Petrographic Description: Brian Mason

The thin section shows a complex breccia of angular fragments (up to 1 mm across) of pyroxene (mostly pigeonite) and plagioclase, with numerous enclaves, in a matrix of comminuted pyroxene and plagioclase with accessory chromite and ilmenite. Most enclaves are ophitic to subophitic intergrowths of plagioclase and pyroxene, but one large elliptical one, 6 mm long, consists largely of pyroxene clasts. Microprobe analyses show pigeonite (with some augite exsolution lamellae) ranging in composition (Wo7-15Fs40-68), and plagioclase An78-81, average An88; the pyroxene in the pyroxene enclave has composition Wo6Fs32En62, and appears to be an inverted pigeonite. The meteorite is a pyroxene-plagioclase achondrite; its classification is a polymict eucrite.

Data from:
  Table 2
  Line 355:
Origin or pseudonym:Main icefield
Mass (g):656
Class:Eu "pm"
Weathering grade:A
Ferrosilite (mol%):40-68
Comments:26Al=68±4; 76005 pairing group
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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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     Catalogue of Meteorites:   (76° 43'S, 159° 40'E)
     Recommended::   (76° 43'S, 159° 40'E)

     This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names)
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