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Kolwezite: (Cu,Co)2(CO3)(OH)2
Comments: Green kolwezite cotton balls on pink cobaltian calcite. Location: Musononi mine, Kolwezi, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Krennerite: AuTe2
Comments: Metallic krennerite crystals on quartz. Location: Emperor mine, Vatukoula, Viti Levu, Fiji. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Kupletskite: K2Na(Mn,Fe++)7(Ti,Nb)2Si8O26(OH)4F
Comments: Bronze-colored stellate crystalline spray of kupletskite on white orthoclase. Location: 3M quarry, Little Rock, Pulaski County, Arkansas, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Lanarkite: Pb2(SO4)O
Comments: White, acicular spray of lanarkite on matrix. Location: Meadowfoot smelter, Wanlockhead, Lanarkshire, Scotland. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Langite: Cu4(SO4)(OH)6·2(H2O)
Comments: Bluish, tabular blades of twinned langite crystals on matrix. Location: Mollau, France. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Lanthanite-(Ce): (Ce,La)2(CO3)3·8(H2O)
Comments: Brownish, square crystals of lanthanite-(Ce) ?. Location: Curitiba, Parana, Brazil. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Laumontite: CaAl2Si4O12·4(H2O)
Comments: Diamond-shaped prism of laumontite with chrysocolla. Location: Azurite mine, Pinal County, Arizona, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Laurionite: PbCl(OH)
Comments: Colorless, stellate spray of acicular Laurionite crystals on matrix. Location: Laurium, Greece. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Lavendulan: NaCaCu5(AsO4)4Cl·5(H2O)
Comments: Bright blue crystals of Lavendulan crystals. Location: Gold Hill mine, Deep Creek Mountains, Tooele County, Utah, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Leadhillite: Pb4(SO4)(CO3)2(OH)2
Comments: Clear crystal of leadhillite on matrix. Location: Leadhills, Lanark, Scotland. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals