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Aragonitic travertine mixed with opaline geyserite & Mn-rich oxides (blackish) along Artesia Geyser's runoff channel (late afternoon, 3 June 2014) 1.jpg - Ser Amantio di Nicolao
Aragonitic travertine mixed with opaline geyserite & Mn-rich oxides (blackish) along Artesia Geyser's runoff channel (late afternoon, 3 June 2014) 2.jpg - Ser Amantio di Nicolao
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