TrekGEO > Mineral Trail > Kanto region > Tochigi pref. > Pyrophanite

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Higashizawa Mine

Kami-Kasuo, Kanuma city, Tochigi pref., Japan


Field of view: 3 mm. Pyrophanite associated with rhodonite. The tabular black crystal and surrounding black grains are pyrophanite. The face with a submetallic luster at the center is (001) cleavage face parallel to the basal plane. The surrounding massive host composed of fine pale pink grains is rhodonite.

Recovered from a chert-hosted bedded manganese deposit subjected to Hornblende-hornfels facies contact metamorphism by S-type (Ilmenite-series) granodiorite.

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