The Satsuma-Iwojima volcano has been emitting continuously high temperature (600• to 900• C) gases for at least 800 years. We identified the minerals that form in response to closed-system cooling of these gases and from airmixing reactions. Major differences compared with the sublimates observed at other volcanoes are the occurrence of wulfenite (PbMoO 4 ) and several mixed chlorides. This is the first report of wulfenite in fumarolic deposits. Thermochemical modeling shows that wulfenite precipitates between 540• and 490• C from a gas with lower sulfur content and/or higher f O 2 , and a higher Mo content (log f SO 2 = −2.1, log f H 2 S = −5, log f O 2 = −18.6, log f H 2 MoO 4 = −4.5, T = 500• C) than the previously reported gas composition. The occurrence of abundant K, Pb, Fe, Zn, Rb and Cs mixed chlorides may be promoted by the low S/Cl of the Satsuma-Iwojima high temperature gases. Natural sublimates of metallic elements (molybdenite, wulfenite, anglesite, Tl-Pb and Tl-Bi sulfides, Mo oxydes and Pb oxides) are deposited along the fumarolic conduit and on the ground under conditions of variable temperatures and f O 2 . The increase in f O 2 due to the mixing of the gases with the atmosphere reduces the volatility of several elements (As, Sn, Na, K and Pb) by promoting their condensation at higher temperatures. As air mixes with volcanic gas in the fumarolic plume, we can expect to find these metals as aerosols.