Sulphur?
Kurokawa, Hishi village, Kiryu city, Gunma pref., Japan
Source for sulphur and Sulphuric acid
Field of view: 1 mm. Bubble-like groups of sulphur. The bubble-like groups of yellow earthy parts are sulphur. The black basement is slate, the host of the deposit.
Recovered from slate near a chert-hosted bedded manganese deposit subjected to Albite-Epidote-hornfels contact metamorphism. This slate is a matrix of the accretionary complex in which the deposit-host chert block is included.
It is considered that sulphur was formed by reduction of SO4 by carbon in slate. SO4 was formed by weathering sulfide minerals in the deposit.
Other localities
- Iwo Jima (Fumarole, Pyramidal)
- Noboribetsu-Jigoku Valley (Fumarole, Pyramidal)
- Numajiri Mine (Fumarole, Massive)
- Jigoku Pond (Fumarole, Crust)
- Noboribetsu-Oyunuma Pond (Fumarole, Spherical)
- Niseko-Oyunuma Pond (Fumarole, Spherical)
- Kurokawa Mine (Mn skarn, Crust)
- Masutomi Mine (Hydrothermal, Massive)
- Takemori (Alpine fissure, Flaky)