High temperature veins mined since ancient times. Famous for its Japan-law quartz twinning (the original "Japan-law" locality). Old quartz specimens from here often bear the obsolete province name "Kai". In reality a group of many mines spread over several villages and mountain slopes, over parts of Kohfu city and neighboring Makioka town. The name "Otome mine" was often applied generically to material from many different mines in the Kinpuzan district.
Refs: Mineralogical Record: 21: 80; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1091.
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