Oki obsidian Shirataki obsidian Himeshima obsidian
Oki(Shimane Pref.)Shirataki(Hokkaidou) Himeshima(Ooita Pref.)
obsidianobsidian obsidian
Houraiji-san pitchstone Koba pearlite
Houraiji-san(Aichi Pref)Koba(Saga Pref.)
pitchstonepearlite(& obsidian)

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