母岩 (ぼがん) — base rock; country rock; gangue; host rock; mother rock; parent rock; wall rock
母岩
ぼ が ん
Base rock; country rock; gangue; host rock; mother rock; parent rock; wall rock
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母岩 (ぼがん) — base rock; country rock; gangue; host rock; mother rock; parent rock; wall rock