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Stibnite (Stayton District. Hollister) (1)	Stibnite crystals (La Salvadora Mine. Oruro) (1)	Stibnite on Barite (1)	Stibnite with Calcite. (Xikuangshan Mine) (1)
Stilbite (Bohemia Mine. Cottage Grove) (1)	Stilbite (Lower New Street Quarry. Paterson) (1)	Stilbite (Pine Creek Mine. Near Bishop.) (1)	Stilbite (Prospect Park Quarry, Prospect Park) (2)
Stilbite (Wasson Bluff) (1)	Stilbite (Yaraudoua Quarries) (1)	Stilbite and Calcite (Moore. Hoewell Township) (1)	Stilbite on Quartz (Franklin) (1)
Stony Meteorite (Plainview) (1)	Stromatolites in the Green River Formation (Near Douglas Pass) (3)	Sub-glacial Water Polish (Tuolumne Meadows. Yosemite National Park) (3)	Sulfur (Agrigento) (1)
Sulfur (Alum) (1)	Sulfur (San Felipe) (1)	Sulphur crystals at Lassen Volcanic National Park (Sulphur Works area. Lassen Volcanic National Park.) (2)	Sulphur pool at Lassen Volcanic National Park (Lassen Volcanic National Park) (1)
Sunrise on the Tower of Babel / Arches National Park (Arches National Park. Near Moab) (1)	Superimposed Stream / Black Canyon of the Gunnison (Colorado) (Black Canyon of the Gunnison National Park) (1)	Surface Ripples in the Sand Dunes (Great Sand Dunes National Park) (1)	Surface Ripples on the Dunes / Great Sand Dunes National Park (Great Sand Dunes National Park) (1)
Surprise Canyon / Capitol Reef National Park (Capitol Reef National Park) (1)	Sutter Buttes / Volcanic Domes (Colusa) (2)	Sutter Buttes / Volcanic Domes (Near Yuba City) (2)	Sutter Buttes / Volcanic Domes (Sutter Buttes. North of Sutter) (1)
Sylvanite (Cresson Mine. Cripple Creek District) (1)	Sylvanite (Cripple Creek District) (3)	Synsedimentary Deformation in the Entrada Sandstone (Arches National Park. Near Moab) (2)	Tafoni Rock formations at Ocean German Ranch Formation (Salt Point State Park) (2)

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