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Yamato 790260
Basic information Name: Yamato 790260
     This is an OFFICIAL meteorite name.
Abbreviation: Y-790260
Observed fall: No
Year found: 1979
Country: Antarctica [Collected by National Institute of Polar Research, Japan]
Mass:help 434 g
Classification
  history:
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 349 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from MN J6(1):

Y-790260, 71-2

         An oblong almost complete stone with considerable fusion crust covering most of the meteorite. Two sides have less fusion crust, where abundant lithic and mineral clasts can be seen. The textures of clasts range from fine-grained, variolitic to coarse-grained, ophitic to subophitic. The largest clast reaches 1.5 cm in diameter. Mineral clasts include white angular plagioclases and honey brown pyroxenes.

         Thin section Y-790260, 71-1 reveals a breccia with plagioclase and pyroxene fragments in a dark matrix which appears to be partly shock-recrystallized. Many pyroxene fragments do not show distinct outer shape and their rims merge into the matrix, making angular plagioclase fragments more prominent. One large plagioclase clast reaches 3 mm in the longest dimension. Very large pyroxene fragments up to 5 mm in diameter are common. They have uniform cores rich in Mg (Ca7Mg64Fe29) and dark brown rims (Ca9Mg45Fe46), and reveal many dark fractures filled with Fe-rich olivines (Fa66). These pyroxenes filled with olivine veins resemble those of the Y-75011, 84 clast. Pyroxene with exsolution textures are rare. One clast consists of fine-grained irregular aggregates of pyroxene rich in opaque inclusions and elongates patches of plagioclase, which do not show well-defined outer shape. One basaltic clast 1 mm in diameter shows a subophitic texture and contains chemically zoned pyroxenes of the Pasamonte type.

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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (71° 30'S, 35° 40'E)
     Recommended::   (71° 30'S, 35° 40'E)

Statistics:
     This is 1 of 40719 approved meteorites from Antarctica (plus 4494 unapproved names)
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