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Kozoite-(Nd): (Nd,La,Sm,Pr)(CO3)(OH) Kozoite-(La): La(CO3)(OH)
Comments: Backscatter electron image of polished section through a sperical aggregate showing the zonation form kosoite-(La) to kosolite-(Nd). (JMPS, v 98, p 138). Location: Cavity in alkaline basalt near Mitsukoshi, Saga Prefecture, Japan. Scale: See Image. © JMPS
Kozulite: NaNa2Mn++4(Fe+++,Al)Si8O22(OH)2
Comments: Dark reddish-black granular kozulite in pale pink rhodonite with dark brown braunite. Location: Tanohata Mine, Tanohata Muro, Shimoheii gun, Iwate, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kraisslite: (Mn++,Mg)24Zn3Fe+++(As+++O3)2(As+++++O4)3(SiO4)6(OH)18
Comments: Yellow crystalline kraisslite in calcite. Location: Sterling Mine, Ogdensburg, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Krasnovite: Ba(Al,Mg)(PO4,CO3)(OH)2·(H2O)
Comments: Pastel blue, vitreous massive krasnovite, associated with white ankerite. Location: Cerro Sapo Carbonatite dike, Cochabamba, Bolivia. Scale: See Image. © Rruff Database
Kratochvilite: (C6H4)2CH2
Comments: Pale yellow to brown crystalline crust of kratochvilite on shale. Location: Zastavka, near Brna, Vychodocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Krausite: KFe+++(SO4)2·(H2O)
Comments: Pale yellowish crystals of krausite on black matrix. Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 1.7 mm. © Thomas Witzke / Abraxas-Verlag
Krauskopfite: BaSi2O4(OH)2·2(H2O)
Comments: White pearly crystalline krauskopfite on quartz. Location: Rush Creek, Fresno County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Krautite: MnAs+++++O3(OH)2·(H2O)
Comments: Pale pink aggregates of krautite on greenish colored matrix. Location: Jachymov, Bohemia, Zapadocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kremersite: (NH4,K)2Fe+++Cl5·(H2O)
Comments: Orange crystals of kremersite. Location: Anna Mine, Alsdorf, Aachen, North Rhine-Westphalia, Germany. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Krennerite: AuTe2
Comments: Metallic krennerite crystals on quartz. Location: Emperor mine, Vatukoula, Viti Levu, Fiji. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Krettnichite: PbMn+++2(VO4)2(OH)2
Comments: Dark brown to nearly black crystals of krettnichite. Location: Johann Shaft; Jakob Tunnel (Dump), Krettnich, Wadern, Saarland, Germany. Scale: Picture size 3.5 mm. © Thomas Witzke / Abraxas-Verlag
Krettnichite: PbMn+++2(VO4)2(OH)2 Brackebuschite: Pb2(Mn,Fe++)(VO4)2(OH)
Comments: Scanning electron microscope image of a prismatic krettnichite (kr) aggregate associated with manganite (ma) and barian brackebuschite (br) in a vug. The inset is a close-up illustrating the morphology of brackebuschite. (Eur. J. Mineral, 13:146). Location: hydrothermal manganite-quartz vein at the historic manganese deposit of Krettnich, Saarland, Germany. Scale: See Image. © Eur. J. Mineral
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
Krohnkite: Na2Cu(SO4)2·2(H2O) Natrochalcite: NaCu2(SO4)2(OH)·(H2O)
Comments: Royal blue kröhnkite and green natrochalcite. Location: Chiquicamata, Chile. Scale: 3.5 x 2 cm. © John Veevaert
Krupkaite: PbCuBi3S6 Friedrichite: Pb5Cu5Bi7S18 Benjaminite: (Ag,Cu)3(Bi,Pb)7S12
Comments: Crystals of a mixture of friedrichite, krupkaite, and benjaminite, with quartz crystals. Location: Estela Mine, Julcani District, Junin, Peru. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Krupkaite: PbCuBi3S6 Paarite: Cu1.7Pb1.7Bi6.3S12
Comments: A mosaic of large grains of a low-Cu bismuthinite derivative, decomposed into an intergrowth of paarite (bd42) and krupkaite (bd49). Location: In quartz veins of the Felbertal scheelite deposit, Salzburg Province, Austria. (CanMin v43:909). Scale: See Image. © Canadian Mineralogist
Krutaite: CuSe2
Comments: Dark gray, metallic, octahedral crystals of krutaite on matrix. Location: El Dragón mine, Quijarro province, Potosí, Bolivia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Krutaite: CuSe2 Kerstenite: PbSeO4 (?) Clinochalcomenite: CuSeO3·2(H2O)
Comments: Tan opaque fibrous kerstenite with possible blue clinochalcomenite on dark krutaite. Location: Mina El Dragon, Potosi, Bolivia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Krutovite: NiAs2
Comments: Gray silivery metallic krutovite grains in matrix. Location: Belorechensk, Krasnodarskij oblast, southeast of Krasnodar, Russia. Scale: Specimen Size 5x2 cm. © Diederik Visser