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Allan Hills A78262
Basic information Name: Allan Hills A78262
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78262
This meteorite may also be called Allan Hills 78262 (ALH 78262) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 26.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  Ureilite
Meteoritical Bulletin:  MB 76  (1994)  Ureilite
NHM Catalogue:  5th Edition  (2000)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 514 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeuphelp
Writeup from AMN 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: ALHA78262

Location: Allan Hills

Field No.: 500

Weight (gms): 26.18

Meteorite Type: Ureilite

 

Physical Description:

The overall shape of this specimen (4.0 x 2.5 x 2.0 cm) is triangular. A thin, dull black fusion crust is present on three surfaces. The remaining surfaces are fracture surfaces that are rough on a small scale. The surface roughness appears to be the result of exposed crystal faces. The overall color is very dark greenish-black. Chipping of the specimen during processing revealed a brownish coarse grained material. Many crystal faces were exposed on the interior surfaces

 

Petrographic Description: Brian Mason

The section consists almost entirely of olivine, in rounded to subhedral grains 0.3-2.2 mm across; most of the olivine is colorless, but some grains have a pale brownish tint. A little pyroxene of similar grain size is present. The grains are rimmed with black carbonaceous material, which contains trace amounts of nickel-iron and troilite. Very thin fusion crust rims part of the section. Microprobe analyses show olivine and pyroxene of uniform composition. Olivine has a composition of Fa22; and a notably high content of calcium (CaO 0.4 weight percent) and chromium (Cr2O3 0.8 weight percent). Pyroxene composition is Wo8Fs19En73, with Cr2O3 1.2 weight percent. This meteorite is a ureilite and resembles ALHA78019 in all respects.

Data from:
  MB76
  Table 2
  Line 438:
Origin or pseudonym:Main icefield
Mass (g):26.2
Class:Ur
Weathering grade:B/C
Fayalite (mol%):22
Ferrosilite (mol%):19
Comments:78019 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 3(2) (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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