Sulphur
Iwo Jima, Ogasawara city, Tokyo, Japan
Source for sulphur and Sulphuric acid
Field of view: 30 mm. A group of sulphur. The quadrangular transparent yellow pyramids are sulphur. There are a few large steps on the crystal faces. The earthy white parts associated with sulphur are probably alunogen.
Recovered from an active fumarole of a volcano in an oceanic arc. Formed in less than a year.
Sulphur from this location was described in 1891.
Sulphur was formed by reacting H2S in volcanic gas with O2 in air:
2H2S + 3O2 = 2H2O + 2SO2
SO2 + 2H2S = 3S (Sulphur) + 2H2O
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)