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Yamato 790447
Basic information Name: Yamato 790447
     This is an OFFICIAL meteorite name.
Abbreviation: Y-790447
Observed fall: No
Year found: 1979
Country: Antarctica [Collected by National Institute of Polar Research, Japan]
Mass:help 3.03 g
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 363 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeup from MN J6(1):

Y-790447, 51-1: Eucrite

         A small broken piece similar to polymict eucrite, but more fragmented. The bottom flat face seems to be abraded. Black fusion crusts are preserved on the top portion. Finer-grained lithic clasts with white laths of plagioclases and gray pyroxenes are abundant.

         A eucritic breccia composed of nearly equigranular pyroxene crystals of dark brown rim and subrounded to short prismatic plagioclase crystals with dusty appearance, and a few opaque minerals. The boundaries between lithic clasts and mineral fragments are not easily recognized, as the pyroxene-rich matrices have dark colored sintered appearance and lack fine grained fragmental materials. In one area, dark yellowish brown pyroxene form continuous domains with a few scattered fragments of plagioclase. Some pyroxene crystals have light colored cores with brownish rims, as in the Y-790266 eucrite. In some areas, a basaltic crystalline texture is preserved, but in other areas such textures are disturbed and matrix looks like fine-grained compacted or sintered dark pyroxenes.

         A large pyroxene crystal reaches up to 1 mm in length, a light colored pyroxene fragment includes euhedral chromites. Pyroxenes with exsolution or dark striation also present. The chemical compositions of pyroxene include Mg-rich components up to Mg/(Mg+Fe)=97, but it is not clear whether they represent diogenitic components or survival of unhomogenized Mg-rich cores of zoned pyroxenes as in Y-790266. The plagioclase composition ranges from An77 to An95.

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 41899 approved meteorites from Antarctica (plus 3802 unapproved names)
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