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Yamato 791538
Basic information Name: Yamato 791538
     This is an OFFICIAL meteorite name.
Abbreviation: Y-791538
Observed fall: No
Year found: 1979
Country: Antarctica [Collected by National Institute of Polar Research, Japan]
Mass:help 419 g
Classification
  history:
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
Writeuphelp
Writeup from MN J9(1):

Y-791538,71-1

This PTS shows an equigranular aggregate of olivine and pyroxene, as rounded to subrounded grains up to 2 mm. The grain boundaries are filled with thin black carbonaceous matrix, and along a few grain boundaries, the matrix appears to be missing. The olivine crystals show well-developed subgrain boundaries with undulatory extinction. They have suffered from secondary reduction and dusty metal particles are found at the rims and around fractures. Olivine has uniform core composition, Fa8.2 . Y-791538 is unusual among ureilites because it contains significant amounts of orthopyroxene (Ca 8.8Mg 83.1Fe 8.1) in addition to pigeonite (Ca 4.8 Mg 88.1 Fe 7.1). The orthopyroxene grains show fine linear lamellae-like features along (100) under cross polarized light. The pigeonite grains are characterized by thick twin bands.

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Search for this meteorite in the NIPR database (Japan):   
References: Published in Meteorite news : Japanese collection of Antarctic meteorites /Meteorite news : Japanese collection of Antarctic meteorites ,9(1),1-58 (2000-06)
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 41908 approved meteorites from Antarctica (plus 3802 unapproved names)
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