Sir: We welcome the opportunity to respond to Bogie and Lawless’ discussion of our paper on the submillimeter-scale oxygen isotope variation of vein quartz from the low-sulfidation style gold deposit at the Hishikari mine. The disputed point is whether or not the bladed and fine-grained quartz precipitated initially as chalcedony and recrystallized to quartz in a subsequent stage. Similarity of texture between chalcedony, e.g., typically found in agate, and flaky or acicular bladed quartz suggests that there is some truth in Bogie and Lawless’ idea. The texture of bladed quartz suggests rapid crystallization from solutions supersaturated with respect to...

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