Presentation Information
[R2P-05]Property and formation process of the overgrowth layer on quartz crystals
*Hiroaki Ohfuji1, Watanabe Rino2 (1. Tohoku Univ. Sci., 2. Ehime Univ. GRC)
Keywords:
Quartz crystal,Overgrowth layer,Wavy extinction,Misorientation
We studied the characteristics and formation process of microcrystalline quartz covering the {100} planes of hydrothermal quartz crystals using natural samples with small and large degrees of the overgrowth. The result showed that the formation of microcrystalline quartz initiates with roughening of {100} surface as a result of rapid increase in supersaturation of the solution, followed by the elongated growth of quartz crystals toward [001] perpendicular to the {100} of the mother quartz crystal through geometric selection.
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