Piemontite Schist

Rock
A large rock located close to the Oyahana Bridge on the Arakawa River in Minano, Minano Town, Chichibu County, Saitama Prefecture. Consisting of exposed piemontite schist containing piemontite, quartz, sericite, and other minerals, a large pothole in the rock was formed via erosion long ago when the rock was a part of the river bottom. As only a few such rocks such as this are found anywhere in the world, it has been designated a Place of Scenic Beauty and a Natural Monument.

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