TrekGEO > Mineral Trail > Tohoku region > Akita pref. > Pyrite

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Funagawaminato-Onnagawa, Oga city, Akita pref., Japan

Source for Sulfuric acid


Field of view: 5 mm. Scepter crystals of pyrite. The dark gray cubes are pyrite. The center of each face is hollow. This crystal form is called a scepter crystal. Scepter crystals were formed by rapid growth of edges and corners. Edges and corners grows faster when the growth rate-determining process is material supply because protruded edges and corners consume materials. The earthy dark gray parts on the crystals are the host mudstone.

Recovered from mudstone deposited in a deep submarine environment.

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