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Kastningite: (Mn++,Fe++,Mg)Al2(PO4 )2(OH)2·8(H2O)
Comments: Colorless crystals of kastningite. Location: Silbergrube Quarry, Waidhaus, Vohenstrauß, Oberpfalz, Bavaria, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Katayamalite: (K,Na)Ca7Li3Ti2[Si6O18]2(OH,F)2
Comments: White katayamalite, in white albite, with brown sugilite. Inset image shows specimen under UV-SW light, albite (dull red), katayamalite (blue-white) and sugilite (non-fluorescent). Location: Iwagi Island, Inland Sea (Setonaikai), Ehime Prefecture, Japan. Scale: Specimen Size 2.5 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Katoite: Ca3Al2(SiO4)3-x(OH)4x x=1.5-3
Comments: Pale yellow to colorless euhedral katoite crystals associated with dark brown andradite crystals. Location: Wilui River, Russia. Scale: See Image. © Rruff Database
Katophorite: Na(CaNa)Fe++4(Al,Fe+++)Si7AlO22(OH)2 Yoshimuraite: (Ba,Sr)2(Mn,Fe)2(Ti,Fe)(Si2O7)2(PO4,SO4)(OH)
Comments: Dark green katophorite associated with yoshimuraite. Inset fragment shows the transparency of the katophorite. Location: Toguchi mine, Shidara, Kitashidara-Gun, Aichi, Japan. Scale: See Image. © Rruff Database
Katoptrite: (Mn,Mg)13(Al,Fe+++)4Sb+++++2Si2O28
Comments: Red-brown grains of katoptite in matrix. Location: Jakobsberg, Nordmark, Sweden. Scale: Box Size 4x6 cm. © Sonke Stolze / Systematic Minerals
Kawazulite: Bi2(Te,Se,S)3
Comments: Sparse tin-white metallic kawazulite vein in quartz. Location: Lone Pine, New Mexico, USA. Scale: Specimen Size 2.5x4 cm. © Diederik Visser
Kazakhstanite: Fe+++5V++++3V+++++12O39(OH)9·9(H2O)
Comments: Deep black sooty coatings of kazakhstanite on silicified rock. Location: Gold Quarry Mine, Carlin Trend, Eureka County, Nevada, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kazakovite: Na6Mn++TiSi6O18
Comments: Yellow brown transparent kazakovite grains in matrix. Location: Mt. Rasvumchorr, Chibiny, Kola, Russia. Scale: Not Given. © Diederik Visser
Keckite: Ca(Mn,Zn)2Fe+++3(PO4)4(OH)3·2(H2O)
Comments: Brown crystals of keckite on matrix. Location: Hagendorf, Bavaria, Germany. Scale: . © Lou Perloff / Photo Atlas of Minerals
Kegelite: Pb8Al4Si8O20(SO4)2(CO3)4(OH)8
Comments: Small, transparent pseudo-cubic kegelite crystals. Location: Tsumbe, Namibia.. Scale: See Image. © William Pinch