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Yamato 790981
Basic information Name: Yamato 790981
     This is an OFFICIAL meteorite name.
Abbreviation: Y-790981
Observed fall: No
Year found: 1979
Country: Antarctica [Collected by National Institute of Polar Research, Japan]
Mass:help 213 g
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 594 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeup from MN J6(1):

Y-790981: Ureilite

         About 1/8 fragment bound by three intersecting flat fractured faces and one round face with partly weathered black crust, which shows polygonal fractures characteristic of ureilites. Round dark crystals with relatively coarse-grained size can be seen on the fractured surface with some spaces between the crystals. White needle crystals are found in the cavities of the surface. Y-790981, 42-5 is predominantly composed of anhedral to euhedral olivine (87%) and pigeonite (8%) with dark carbonaceous (C) matrix (5%) at the grain boundaries. The olivine crystals display fracturing and undulatory extinction and subgrain boundaries. Average olivine core composition is Fa21, and in contact with C matrix the composition is enriched in Mg by reduction, and sometimes a Fe-free pigeonite is produced at the rim. The pigeonites have some tiny inclusions. The pigeonite composition Ca8Mg74Fe18 is similar to those of Y-74123 and is rich in Al2O3 (1.1 wt%) and Cr2O3 (1.1 wt%). In some crystals there are inclusions of diopside Ca37Mg58Fe5, more Mg-rich than that expected from the coexisting pair. The most notable texture of the pigeonite is dusty dark appearance.

Search for this meteorite in the NIPR database (Japan):   
References: Published in Meteorites news : Japanese collection of Antarctic meteorites /Meteorites news : Japanese collection of Antarctic meteorites ,6(1),1-47 (1996-03)
Never published in the Meteoritical Bulletin
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     Catalogue of Meteorites:   (71° 30'S, 35° 40'E)
     Recommended::   (71° 30'S, 35° 40'E)

     This is 1 of 41908 approved meteorites from Antarctica (plus 3802 unapproved names)
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