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Kochkarite: PbBi4Te7
Comments: Bright silvery veinlets of kochkarite throughout matrix. Location: Kochkar' Au deposit, Plast, Urals Region, Russia. Scale: Overall: 2.5 x 2 x 1.5 cm. © Tom Loomis / Dakota Matrix
Kristiansenite: Ca2ScSn(Si2O7)(Si2O6OH)
Comments: Two very nice, clear, intergrown crystals of kristiansenite in pinkish matrix. Location: Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway. Scale: Crystal size 1 mm. © Tom Loomis / Dakota Matrix
Krupkaite: PbCuBi3S6
Comments: Acicular, fine metallic crystal sprays of krupkaite to 4mm with pale yellow manganoan siderite. Location: Julcani district, Peru. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix
Kurnakovite: MgB3O3(OH)5·5(H2O)
Comments: Chalky white outer alteration, else gray, translucent, coarsely-crystalline kurnakovite. Location: The Open Pit, Boron, Kern Co., California, USA. Scale: 5x4x3cm. © Tom Loomis / Dakota Matrix
Lammerite: Cu3[(As,P)O4]2
Comments: Deep, lustrous green lammerite crystals to about 1mm throughout vuggy matrix. Location: Guanaco mine, Taltal, Antofagasta, Chile. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix
Lamprophyllite: Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2
Comments: Deep-red, acicular spray of lamprophyllite in matrix. Location: Kola Peninsula, Russia. Scale: Crystal size 1.5 cm. © Tom Loomis / Dakota Matrix
Lasalite: Na2Mg2(V10O28)·20H2O
Comments: Bright orange efflorescent lasalite crust on sandstone. Location: Vanadium Queen mine, San Juan Co., Utah, USA. Scale: Picture Size 2 x 2 cm. © Tom Loomis / Dakota Matrix
Laurelite: Pb7F12Cl2
Comments: Snow white acicular crystals of laurelite. Location: Grand Reef mine, Graham Co., Arizona, United States. Scale: Crystal size 7 mm. © Tom Loomis / Dakota Matrix
Leifite: Na2(Si,Al,Be)7(O,OH,F)14
Comments: Snow white, prismatic, crystal aggregate of leifite. Location: Poudrette Quarry, Mont St. Hilaire, Quebec, Canada. Scale: 3x1cm. © Tom Loomis / Dakota Matrix
Lemoynite: (Na,K)2CaZr2Si10O26·5-6(H2O)
Comments: Yellowish white, radial, spherical spray of prismatic Lemoynite crystals to 5mm in diameter on matrix. Location: Mont St. Hilaire, Quebec, Canada. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix