Trace Elements and Minerals in Fumarolic Sulfur: The Case of Ebeko Volcano, Kuriles

Figure 6

Major and rare phases from fumarolic incrustations of Ebeko volcano. (a) Molten and solidified sulfur with “cheese texture.” (b) Opal with contraction cracks surrounded by sulfur. (c) Octahedral pyrite crystals mixed with silicate particles. (d) Aggregate of sassolite (H₃BO₃) crystals. (e) Covellite (CuS) crystals on sulfur. (f) Chalcocite (Cu₂S) aggregates and a particle of TiO₂ (rutile?) inside a pore. (g) Barite, magnetite, rutile, and opal aggregates extracted from sulfur. (h) Euhedral crystals of scheelite. SEM BSE images.

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