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Yamato 790266
Basic information Name: Yamato 790266
     This is an OFFICIAL meteorite name.
Abbreviation: Y-790266
Observed fall: No
Year found: 1979
Country: Antarctica [Collected by National Institute of Polar Research, Japan]
Mass:help 208 g
NHM Catalogue:  5th Edition  (2000)  Eucrite-mmict
NIPR Catalogue:  2000 Edition  (2000)  Eucrite-mmict
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-790266, 61-1: Eucrite

         An angular stone covered with thin fusion crust, which is partly lost. The interior is difficult to see but it is rich in clasts. About half of this meteorite consists of a medium-grained crystalline eucrite clast, but it is essentially polymict with a small amount of matrix, because some small clasts show coarse-grained texture and the others fine-grained ophitic texture. Mineral fragments are not abundant.

         The thin section of matrix-rich portion (Y-790266, 92) shows a fine-grained breccia of angular fragments of pyroxene and plagioclase, in a matrix of comminuted pyroxene and plagioclase with accessory opaque minerals. However, some portions may be brecciated medium-grained basalt, which is the most common clast in this eucrite. Pyroxenes in strongly shocked areas show fine-grained granoblastic texture with elongated or deformed plagioclase. Vitric clasts with zoned pyroxene phenocrysts and dark aphanitic clasts are also present. The thin section of a medium-grained basalt (Y-61-2) with subophitic to intergranular texture consists of stubby plagioclase laths with inter-granular pyroxenes. Microprobe analyses show pyroxene ranging in composition from core pigeonite Ca6Mg36Fe58 to rim augite Ca28Mg32Fe40 and plagioclase Ab15An84Or1 to Ab23An75Or2. A few large pyroxenes have a Mg-rich core Ca5Mg67Fe28 zoned toward Fe-rich pigeonite. Fragments of this type basalt are common in the brecciated matrix. PTS, 61-1 contains a Stannern-like clast and large dark brown pyroxenes.

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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