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Allan Hills A78019
Basic information Name: Allan Hills A78019
     This is an OFFICIAL meteorite name.
Abbreviation: ALHA78019
This meteorite may also be called Allan Hills 78019 (ALH 78019) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 30.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 2(2)  (1979)  Ureilite
Meteoritical Bulletin:  MB 76  (1994)  Ureilite
NHM Catalogue:  5th Edition  (2000)  Ureilite
NIPR Catalogue:  2000 Edition  (2000)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 497 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
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.: ALHA78019

Location: Allan Hills

Field No.: 274

Wight (gms): 30.3

Meteorite Type: Ureilite

 

Physical Description:

Fusion crust is present on all surfaces but is patchy and does not cover the entire stone. The fusion crust is smooth, dull brownish black and has polygonal fracture. Where the fusion crust is not present the surface is reddish-brown and crystalline. One fracture penetrated the entire stone. The stone (3.0 x 2.5 x 3.0 cm) was cleaved in half and no unweathered material was exposed. The entire sample is reddish-brown throughout. The interior is crystal-line which breaks apart when handled.

 

Petrographic Description: Brian Mason

The thin section shows an aggregate of rounded to subhedral grains (0.5 - 3 mm across) of olivine, with minor pyroxene. The grains are rimmed with black carbonaceous material. Trace amounts of troilite and nickel-iron are present, the latter largely altered to translucent brown limonite concentrated along grain boundaries. Microprobe analyses show olivine of uniform composition (Fa22) with notably high CaO (0.4%) and Cr2O3 (0.7%) contents; the pyroxene is a pigeonite of composition Wo10Fs18En72. This meteorite is a ureilite, with mineral compositions essentially identical to those in the Kenna ureilite (Geochim. Cosmochim. Acta, 40, p. 1430, 1976); it appears to be relatively unshocked compared to most ureilites.

Data from:
  MB76
  Table 2
  Line 270:
Origin or pseudonym:Main icefield
Mass (g):30.3
Class:Ur
Weathering grade:B/C
Fayalite (mol%):23
Ferrosilite (mol%):18
Comments:78019 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 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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