Small volcanic island with very high temperature fumaroles (up to 880 degrees C). Rhyolite leached out by acid fumaroles was mined for silica (up to 97% SiO2). Fumarole gases here have the highest content of molybdenum vapour (1ppm) and gold vapour (32ppb) of any volcano (Hedenquist, et al., 1994).
(Note: This is NOT the same Iwo-jima that became famous in WW2 - See under Tokyo Prefecture.)
Mineral List
30 entries listed. 25 valid minerals.
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