Hiichan tries her hand at mining Oya Stone and thereafter, eating pizza baked in an Oya Stone oven
Oya Stone is a rare volcanic stone that is soft and can be easily carved, yet is durable. It can only be mined in the Oya District of Utsunomiya, Tochigi Prefecture (Hiichan’s home prefecture). It was created as a result of formation of tuff from a volcanic eruption almost twenty million years ago.
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