Graphite-bearing crystalline schist, Jimmu Mine, Sogo, Mihara-shi, Hiroshima, 2021

Graphite-bearing crystalline schist, Jimmu Mine, Sogo, Mihara-shi, Hiroshima, 2021 by Katsuaki Watanabe

石墨を含む結晶片岩（広島県三原市宗郷神武鉱山）