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Kobellite: Pb22Cu4(Bi,Sb)30S69
Comments: Dark gray metallic crystalline kobellite with quartz. Location: Crabtree Quarry, Raleigh, Wake County, North Carolina, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Kochsandorite: CaAl2(CO3)2(OH)4·H2O
Comments: Pearly circles of radiating white microcrystals of kochsandorite on coal. Location: Many coal deposit, Bicske-Zsambeki Basin, Tatabanya. Scale: 2.5x1.7x1.1 cm. © Richard Dale / Dale Minerals
Comments: White fibers of kochandorite on coal-marl matrix. Location: Mány coal field, Tatabánya, Hungary. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species
Koechlinite: Bi2MoO6
Comments: Greenish yellow crystal of koechlinite on quartz. Location: Adam Heber Mine, Neustädtel, Schneeberg district, Erzgebirge, Saxony, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Koenenite: Na4Mg4Cl12·Mg5Al4(OH)22
Comments: Koenenite with cleavage planes. Location: Bergmannssegen-Hugo Mine, Lehrte, near Hanover, Lower Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Kogarkoite: Na3(SO4)F
Comments: Pale green granular mass of kogarkoite with yellow native sulfur. Location: Vulcano, Sicily, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kokchetavite: KAlSi3O8
Comments: Fragment of eclogite containing kokchetavite which occurs as inclusions in clinopyroxene and garnet (see inset BSE images). Location: Kumde-Kul Area, Kokchetav Massif, Kokchetav Oblast', Kazakhstan. Scale: Specimen Size 6x6x6 mm. © Sergey Vasiliev / Systematic Mineralogy
Koktaite: (NH4)2Ca(SO4)2·(H2O)
Comments: Tan to white scaly coating of koktaite. Location: Zastavka, near Brna, Vychodocesky, Czech Republic. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kolarite: PbTeCl2
Comments: Steel-gray, metallic, massive, polished fragment of kolarite embedded in epoxy. Location: Oktyabr'sky Mine, Noril'sk, Putoran Mts, Taymyrskiy Autonomous Okrug, Eastern-Siberian. Scale: See Image. © Rruff Database
Kolarite: PbTeCl2 Radhakrishnaite: PbTe3(Cl,S)2
Comments: Kolarite (1) and radhakrishnaite (2), replacing altaite (white) in galena (ight grey). (CanMin, v23:501). Location: 1500 m level, Kolar gold deposit, India. Scale: Scale Bar 0.02 mm. © Canadian Mineralogist
Kolbeckite: ScPO4·2(H2O)
Comments: Spherical ball of acicular kolbeckite on matrix. Location: Gleichenberger Klause, Bad Gleichenberg, Steiermark, Austria. Scale: Specimen size 1.5 mm. © John Veevaert
Kolicite: Mn7Zn4(AsO4)2(SiO4)2(OH)8
Comments: Minute orange crystal of kolicite in franklinite. Location: Sterling Mine, Ogdensburg, Sussex County, New Jersey, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kolovratite: Hydrous vanadate of Ni and Zn
Comments: Aqua-colored botryoidal crust of kolovratite. Location: Mina Ojuela, Mapimi, Durango, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
Komarovite: (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2·3.5(H2O)
Comments: Pale pink crystalline komarovite vein in syenite rock. Location: Mount Karnasurt, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kombatite: Pb14(VO4)2O9Cl4 Hausmannite: Mn++Mn+++2O4
Comments: Yellow kombatite crystals in black hausmannite. Location: Kombat Mine, Otavi, Namibia. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Koninckite: Fe+++PO4·3(H2O) (?)
Comments: Pale pink botryoidal crust of koninckite on rock. Location: Richelle, Liege, Belgium. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Konyaite: Na2Mg(SO4)2·5(H2O)
Comments: white powdery konyaite. Location: Great Konya Basin, Konya, Turkey. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Koragoite: (Mn++,Fe+++)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20
Comments: Black tabular crystals of koragoite in matrix. Location: Vez-Dara River Valley, Shakhdara Range, Khorog Region, Gorno-Badakhshan District, Pamir Mts, Tajikistan. Scale: Picture size 1.8 mm. © Thomas Witzke / Abraxas-Verlag