Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences
2016 Annual Meeting of Japan Association of Mineralogical Sciences
Session ID : R2-P15
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Host: Japan Association of Mineralogical Sciences

R2: Crystal structure, crystal chemistry, physical properties of minerals, crystal growth and applied mineralogy
Anisotropic growth of the X-shaped quartz twin in accordance with Japan law
*Koichi Momma, Toshiro Nagase
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Keywords: quartz, Japanese twin, twin composition plane
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Abstract

X-shaped Japan-law twins of quartz from two localities in Japan, i.e., Oshigahae, Miyazaki Prefecture and Mitsuiwa, Gunma Prefecture, were analyzed by cathodoluminescence and EBSD. It was revealed that all of the examined samples evolved from a single center and developed as penetration twins. This formation mechanism is in contrast to the previously believed mechanism, which considers the X-shaped twins as a result of a combination of two y-shaped twins.

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© 2016 Japan Association of Mineralogical Sciences
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