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Columnar Jointing in Lava Flows / Grand Canyon (Along the Colorado River. Grand Canyon National Park) (1)	Concentric Zoning in an Orthoclase Crystal (Near Sonora Pass) (1)	Concretions (Carmel Mountain Preserve) (2)	Confluence of the Little Colorado River and the Colorado River / Grand Canyon National Park (Along the Colorado River. Grand Canyon National Park) (1)
Conichalcite (Gold Hill) (1)	Conichalcite (Higgens Mine. Bisbee) (1)	Conichalcite with Calcite (Ojuela Mine. Mapimi) (1)	Conness Lakes / Glacial Tarns (Hoover Wilderness Area. Inyo National Forest) (1)
Cookie Cliff Rockslide / Yosemite National Park (Along the Merced River. Yosemite National Park) (1)	Cooled lava flow thrusts up against rainforest trees on the lower slopes of Arenal Volcano. (Arenal Volcano National Park) (1)	Copper 'Skull' (Centennial Mine. Near Calumet) (1)	Copper crystals (1)
Copper mine tailings (Caruthers Canyon, Mojave National Preserve) (1)	Copper ore (Caruthers Canyon, Mojave National Preserve) (1)	Copper pseudomorph after Azurite (2)	Coral head uplifted in 1954 from volcanic activity at Urbina Bay, Isabela Island, Galapagos Islands (Urbina Bay, Isabela Island, Galapagos Islands) (1)
Corkscrew Peak / Grapevine Mountains / Death Valley National Park (Grapevine Mountains / Death Valley National Park) (1)	Corundum var. Ruby (Arendal) (3)	Courthouse Towers Area / Arches National Park (Arches National Park. Near Moab) (1)	Courthouse Wash area / Arches National Park (Arches National Park. Near Moab) (1)
Covellite (Summitville District) (3)	Crater Mountain (California) (Mono Craters area. Inyo National Forest. South of Lee Vining) (1)	Crater Mountain - Volcanic Vent (BLM Crater Mountain Area of Critical Environmental Concern. Near Big Pine) (1)	Creedite (Cresson Mine. Cripple Creek) (1)
Creedite (Cresson Open Pit. Cripple Creek District) (1)	Creedite (Henderson Mine. Near Empire) (2)	Creedite (Liberty Mine. Tonopah) (1)	Crocoite (Adelaide Mine) (1)
Crocoite (Dundas) (1)	Crocoite and Pyromorphite (Kozminski Mine. Dundas) (1)	Cross bedding in navajo sandstone, Checkerboard Mesa, Zion National Park, Utah (Checkerboard Mesa, Zion National Park) (1)	Cross-bedding in an eolian sandstone (Capitol Reef National Park) (1)

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