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

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Hagidaira Mine

Konaka, Azuma village, Midori city, Gunma pref., Japan


Field of view: 3 mm. A crystal of pyrophanite. The hexagonal dakr red platy crystal with striations is pyrophanite. The transparent part at the base of pyrophanite is quartz.

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

Pyrophanite from this location was described in 1962.

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