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Kornerupine: (Mg,Fe++)4Al6(SiO4,BO4)5(O,OH)2
Comments: Greenish gray mottled crystal prism of kornerupine. Location: Western Hart's Range, Northern Territory, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Korzhinskite: CaB2O4·(H2O)
Comments: Translucent fragment of korzhinskite. Location: Novofrolovskoye, Sverdlovsk District, Northern Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kosmochlor: NaCr+++Si2O6
Comments: Green resinous massive kosmochlor, variety ureyite, in serpentinite. Location: Myanmar. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Koutekite: Cu5As2 Algodonite: Cu6As
Comments: Silvery metallic koutekite with darker gray algodonite. Location: Mohawk Mine, Keweenaw County, Michigan, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
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
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
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
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
Kukharenkoite-(La): Ba2(La,Ce)(CO3)3F
Comments: Very small olive-green sprays of kukharenkoite-(La) crystals. Location: Kirovsky apatite mine, Mount Kukisvumchorr, Khibina massif, Kola Peninsula, Russia.. Scale: Crystal Size to 0.02 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Kupletskite-(Cs): (Cs,K)2Na(Mn,Fe++,Li)7(Ti,Nb)2Si8O26(OH)4F Tienshanite: BaNa2MnTiB2Si6O20
Comments: Dark olive-green colored crystalline tienshanite with cesium-kupletskite in microcline. Location: Dara-Pioz, Tien-Shan, Tadzhikistan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kurchatovite: Ca(Mg,Mn,Fe++)B2O5
Comments: Gray crystalline kurchatovite (arrow) in matrix (distinguishable by violet fluorescence). Location: Solongo, Republic of Buryatia, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kyrgyzstanite: ZnAl4(SO4)(OH)12·3(H2O)
Comments: A small coating of greenish kyrgyzstanite.. Location: Kara-Tangi U deposit, Batken Oblast, Kyrgyzstan. Scale: Field of view 0.3 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Labuntsovite-Mg: Na4K4(Ba,K)(Mg,Fe)1+xTi8(Si4O12)4(O,OH)8·10(H2O)
Comments: Orange-brown crystal of labuntsovite-Mg, sitting on a bed of platy catapleiite crystals, with dolomite. Location: Zheleznyi Mine (Iron Mine), Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Crystal Size 0.15 cm. © Jeff Weissman / Photographic Guide to Mineral Species
Lacroixite: NaAl(PO4)F Berlinite: AlPO4
Comments: Pale olive green crystalline lacroixite with white crystalline berlinite. Location: Rusororo Pegmatite, Gatumba, Gisenyi, Rwanda. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Lammerite: Cu3[(As,P)O4]2
Comments: Emerald green crystalline lammerite in matrix. Location: Laurani Mine, South Yeronime, Laurani, La Paz, Bolivia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Lamprophyllite: Na2(Sr,Ba)2Ti3(SiO4)4(OH,F)2 Barytolamprophyllite: Ba2Na3(Fe+++,Ti)3(Si2O7)2(O,OH,F)4
Comments: Brownish-yellow barytolamprophyllite on dark green lamprophyllite. Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Landauite: NaMnZn2(Ti,Fe+++)6Ti12O38
Comments: Black granular landauite in matrix. Location: Northwest Territories, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species