Jamesonite
Otaki, Chichibu city, Saitama pref., Japan
Field of view: 5 mm. Jamesonite crystals. The filiform black crystals are jamesonite. The yellow part at the lower right is pyrite.
Recovered from an open space of sulfide minerals in 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).
Jamesonite from this location was described in 1947.
Other localities
- Chichibu Mine (Hydrothermal Skarn, Filiform)
- Tsugu Mine (Hydrothermal, Filiform)