TrekGEO > Mineral Trail > Kanto region > Saitama pref. > Johannsenite

Japanese page


Chichibu Mine

Otaki, Chichibu city, Saitama pref., Japan


Field of view: 20 mm. Crystals of johannsenite. The columnar group of translucent pale bluish-green prisms is johannsenite. The black grains exhibiting perfect cleavage are sphalerite.

Recovered from a moderately low-temperature hydrothermal deposit combined with skarn formed by contact metamorphism of I-type (Magnetite-series) quartz diorite. Formed in the late Miocene (6 Ma).

Johannsenite from this location was described in 1964.

Other localities

  • Chichibu Mine (Hydrothermal Skarn, Prismatic)
  • Akatani mine (Metasomatic Skarn, Prismatic)
  • Kawazu mine (Hydrothermal, Prismatic)
Copyright (c) 2017 NariNari, All Rights Reserved.