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Topaz (1)	Topaz (Adun-Tchalon) (1)	Topaz (Ouro Preto Diistrict) (1)	Topaz on Microcline var. Amazonite (Topaz Butte. Florissant) (1)
Topographic survey marker on summit (Ship Rock off Yaqui Pass Rd, Anza Borrego Desert) (1)	Torbernite (Musonol Mine) (2)	Tourmaline var. Dravite (Yinniethbarra) (2)	Tourmaline var. Elbaite on Quartz (Himalaya Mine. Mesa Grande District) (2)
Tourmaline var. Schorl on Quartz (Thompson Peak. Near Susanville) (2)	Trees Killed by Geothermal Activity / Lassen Volcanic National Park (Devil's Kitchen area. Lassen Volcanic National Park) (1)	Trees killed by toxic volcanic emissions (Horseshoe Lake area. Inyo National Forest. Near Mammoth Lakes) (4)	Tse Bit'a'i (Shiprock), San Juan County, New Mexico (Tse Bit'a'i (Shiprock)) (1)
Tufa Beds at Mono Lake (Mono Lake Tufa State Reserve. Near Lee Vining) (2)	Tufa Towers (Trona Pinnacles National Natural Landmark. Near Trona) (8)	Tufoni Sandstone Formation (Bean Hollow State Beach) (2)	Tugtupite (Kvanefjeld area) (3)
Tundra on Mount Evans (Colorado) (Mount Evans. Arapaho National Forest) (1)	Turquoise (Cortez District) (1)	Turquoise (King Mine. Manassa) (1)	Turquoise (Lynch Station) (1)
Turret Arch / Arches National Park (Arches National Park. Near Moab) (1)	Turret Arch Area / Arches National Park (Arches National Park. Near Moab) (1)	U.S. Borax Boron Mine (Near Boron) (1)	Ubehebe Crater / Death Valley National Park (Ubehebe Crater. Death Valley National Park) (1)
Ubehebe Volcanic Crater / Death Valley National Park (Ubehebe Volcanic Field / Death Valley National Park) (1)	Ulexite (Near Boron) (1)	Ulexite (U.S. Borax Boron Mine. Near Boron) (1)	Ulexite on Colemanite (Corkscrew Mine. Death Valley National Park) (1)
Underground river at Xcaret Cultural Park (Mexico) (Xcaret Cultural Park, Playa Del Carmen) (1)	Unusual sandstone formation on cliff face (Wadi Rum) (1)	Upper Blue Hills and Factory Butte (Upper Blue Hills) (1)	Uvarovite (Outokumpu Ore Field) (1)

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