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Allan Hills A78158
Basic information Name: Allan Hills A78158
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78158
This meteorite may also be called Allan Hills 78158 (ALH 78158) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 15.1 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.: ALHA78158

Location: Allan Hills

Field No.: 362

Weight (gms): 15.1

Meteorite Type: Polymict Eucrite


Physical Description:

This is not a complete specimen. Fusion crust which is shiny black, is present on one surface. All other surfaces are fracture surfaces which show a medium gray matrix with white flecks. Some clasts (<1 mm) are oxidized to a yellow color. An area ~.5 cm diameter on the B surface is a darker gray and appears very homogeneous -- this appears to be a rounded clast. One fracture goes completely across the sample. Overall dimensions are 3.0x2.5x2 cm. This meteorite looks very similar in appearance to ALHA78165.


Petrographic Description: Brian Mason

The polished thin section of this meteorite is identical in all respects with that of ALHA78132 (except for the pyroxene xenolith in ALHA78132). Microprobe analyses show similar composition for both pyroxene and plagioclase. In the absence of evidence to the contrary it appears that ALHA78158 and ALHA78132 are probably pieces of a single meteorite.

Data from:
  Table 2
  Line 376:
Origin or pseudonym:Main icefield
Mass (g):15.1
Class:Eu "pm"
Weathering grade:A
Ferrosilite (mol%):40-68
Comments: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 44048 approved meteorites from Antarctica (plus 3802 unapproved names)
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