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Sphalerite (Picher) (1)	Sphalerite on Quartz (Commodore Mine. Creede District) (1)	Sphalerite var. Schalenblende (Eagle Mine. Gilman) (1)	Sphalerite with Fluorite (Elmwood Mine) (1)
Sphalerite with Pyrite and Quartz (Maine Mine. Silver Plume) (1)	Sphalerite with Quartz (Idarado Mine. Telluride District) (1)	Sphalerite with Siderite (Bachelor Mine. Creede District) (1)	Spheroidal weathering of basalt in the Mindego Formation (Russian Ridge Open Space Preserve) (4)
Spodumene var. Kunzite (3)	Spodumene var. Kunzite with Smoky Quartz (1)	Spouting Horn (Hawaii) (Spouting Horn Park) (2)	Spring-deposited Travertine Speleothems (Havasu Creek. Grand Canyon National Park) (1)
Spring-deposited Travertine Speleothems (Stevens Creek Canyon. Stevens Creek County Park. Near Cupertino) (7)	Spring-deposited Travertine Speleothems (Stevens Creek County Park. Cupertino) (3)	Spring-deposited Travertine Speleothems / Grand Canyon National Park (Along the Colorado River. Grand Canyon National Park) (1)	Squeeze-ups on a Lava Flow (Craters of the Moon National Monument) (2)
Stalactites / Lehman Caves / Great Basin National Park (Lehman Caves. Great Basin National Park) (1)	Stalactites and Cave Drapery / Lehman Caves / Great Basin National Park (Lehman Caves. Great Basin National Park) (2)	Stalactites with Helictites / Lehman Caves / Great Basin National Park (Lehman Caves. Great Basin National Park) (1)	Stalagmite with Corraloids / Lehman Caves / Great Basin National Park (Lehman Caves. Great Basin National Park) (1)
Stalagmites / Lehman Caves / Great Basin National Park (Lehman Caves. Great Basin National Park) (1)	Stalagmites with Corraloids / Lehman Caves / Great Basin National Park (Lehman Caves. Great Basin National Park) (1)	Stanislaus Table Mountain / Inverted Topography (Along Hwy 120. Near China Camp) (2)	Star Dune and Transverse Dune in Mesquite Dune Field (Mesquite Dunes area. Death Valley National Park) (1)
Star Dune in Mesquite Dune Field (Mesquite Dunes area. Death Valley National Park) (1)	Steam from Costa Rica Volcano (1)	Steam from Volcano in Costa Rica (2)	Steam vent at Hawaii Volcanoes National Park (Hawaii) (Hawaii Volcanoes National Park) (1)
Steam vents at Lassen Volcanic National Park (Lassen Volcanic National Park) (1)	Stibiconite Pseudomorph after Stibnite (Wadley, Municipio de Catorce) (1)	Stibnite (Maramures) (1)	Stibnite (Stayton District. Hollister) (1)

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