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

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Hagidaira Mine

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


Field of view: 1 mm. Opal associated with rhodonite. The massive white to transparent parts are opal. The red- and blue-based rainbow color is the play of color of noble opal. The surrounding red host is rhodonite. The red tabular crystals in opal is rhodonite.

Recovered from a chert-hosted bedded manganese deposit subjected to Hornblende-hornfels facies contact metamorphism.

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