Wikimedi'Òc

Aragonitic travertine mixed with opaline geyserite & Mn-rich oxides (blackish) & Fe-rich oxides (yellowish and orangish brown) on NE side of Gray Bulger Geyser (late afternoon, 3 June 2014) 1.jpg - Ser Amantio di Nicolao

Aragonitic travertine mixed with opaline geyserite & Mn-rich oxides (blackish) & Fe-rich oxides (yellowish and orangish brown) on NE side of Gray Bulger Geyser (late afternoon, 3 June 2014) 2.jpg - Ser Amantio di Nicolao