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Allan Hills A78006
Basic information Name: Allan Hills A78006
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78006
This meteorite may also be called Allan Hills 78006 (ALH 78006) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 8 g
Antarctic Meteorite Newsletter:  AMN 2(2)  (1979)  Howardite
AMN 3(2)  (1980)  Eucrite-pmict
AMN 4(1)  (1981)  Howardite
Meteoritical Bulletin:  MB 76  (1994)  Howardite
NHM Catalogue:  5th Edition  (2000)  Howardite
NIPR Catalogue:  2000 Edition  (2000)  Howardite
MetBase:  v. 7.1  (2006)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 453 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
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. ALHA78006

Location: Allan Hills

Field No.: 277

Weight (gms): 8.0

Meteorite Type: Howardite


Physical Description:

This is a nearly complete specimen (3.0 x 1.5 x 2.0 cm). Shiny black fusion crust covers all of the stone with the exception of portions of the E, W and S surfaces. There the sample is void of fusion crust, light to dark gray interior material is exposed. A non-weathered brecciated surface with no metal exposed was revealed upon leaving this stone in half.


Petrographic Description: Brain Mason

The thin section shows a complex breccia of angular fragments (grains up to 1 mm long) of pyroxene (orthopyroxene and pigeonite and plagioclase, with numerous polymineralic enclaves, set in a matrix of comminuted pyroxene and plagioclase. Accessory chromite and ilmenite and trace amounts of troilite and nickel-iron are present. The enclaves are holocrystalline pyroxene-plagioclase aggregates, and vary considerably in texture from coarse-grained gabbroic to fine-grained basaltic types. Slight weathering is indicated by small areas of rusty staining, usually in association with metal grains. Microprobe analyses show a wide range in pyroxene composition: Wo2-12En31-72Fs25-61; a number of grains with uniform composition Wo3En11Fs26 suggests the presence of a diogenitic component. Plagioclase averages An91. A single grain of iron-rich olivine (Fa81) was analyzed. The meteorite is classified as a polymict pyroxene-plagioclase achondrite (howardite).

Data from:
  Table 2
  Line 262:
Origin or pseudonym:Main icefield
Mass (g):8
Weathering grade:A
Ferrosilite (mol%):25-61
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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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