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Koehn Dry Lake (Near California City) (1)	Kröhnkite (Chuquicamata Mine. Calama, , Chile.) (1)	Ktenasite on Chalcopyrite with Sphalerite (Commodore #5 Mine. Creede Mining District.) (1)	Kurnakovite and Ulexite (Boron Open Pit Mine. Boron) (1)
Laguna Calientes, a large turquoise lake in Poas Volcano crater, with steam from fumaroles mixed with cloudforest cover. (Parque Nacional Vulcan Poás (Poas Volcano National Park), in central Costa Rica.) (3)	Laguna Calientes, a large turquoise lake in Poas Volcano crater, with steam from fumaroles. (Parque Nacional Vulcan Poás (Poas Volcano National Park), in central Costa Rica.) (1)	Lake Hill - Landslide Block (Panamint Valley. Death Valley National Park) (1)	Lake in Costa Rica Volcanic Crater (1)
Lake Superior Agate (Sandbar, Mississippi River near Marquette) (3)	Landscape Arch / Arches National Park (Arches National Park. Near Moab) (1)	Large Transverse Dunes / Great Sand Dunes National Park (Great Sand Dunes National Park) (2)	Large Transverse Dunes and Small Barchanoid Dunes (Great Sand Dunes National Park) (1)
Lassen Peak in Cascade Range (Lassen Volcanic National Park at Lassen Peak) (1)	Lassen Volcanic National Park in Cascade Range (Lassen Volcanic National Park) (1)	Lassen Volcanic National Park in Cascade Range (Lassen Volcanic National Park at Sulphur Works) (1)	Laumontite (Whipple Quarry Mine) (1)
Laumontite (Yosemite National Park) (1)	Laumontite on Quartz. (Pine Creek Mine. West of Bishop) (1)	Laurel Mountain (California) (Laurel Mountain. Ansel Adams Wilderness Area. Inyo National Forest) (1)	Lava dike associated with Tse Bit'a'i (Shiprock), San Juan County, New Mexico (Tse Bit'a'i (Shiprock)) (1)
Lava Flow / 'Blue Dragon' Basalt (Craters of the Moon National Monument) (2)	Lava Flow / 'Blue Dragon' Basalt (detail) (Craters of the Moon National Monument) (1)	Lava Tubes / Craters of the Moon National Monument (Craters of the Moon National Monument) (4)	Lavasicles / Lava Drip Features (Valentine Cave. Lava Beds National Monument. Near Tulelake) (2)
Layers of volcanic rock at Sugarloaf Peak, Puerto Egas, James Island, Galapagos Islands (Puerto Egas, James Island, Galapagos Islands) (1)	Lazurite (Sar-e Sang, Koksha Valley, Khash and Kuran Wa Munjan Districts) (1)	Leadhillite (Mammoth Mine. Tiger) (1)	Lee Vining Falls in Sierra Nevada (Inyo National Forest, Lee Vining Creek at Lee Vining Falls, E Yosemite National Park, elev. 2884 m (9000 ft.)) (1)
Legrandite (Ojuela Mine. Mapimi) (1)	Leightonite (Chuquicamata Mine. Calama) (1)	Lembert Dome / Roche moutonnée (Tuolumne Meadows. Yosemite National Park) (1)	Liebigite (Schwartzwalder Mine. Ralston Creek District) (3)

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