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Johillerite: Na(Mg,Zn)3Cu(AsO4)3
Comments: Violet-blue grains of johillerite on matrix. Location: Tolbachik Volcano, Kamchatka, Russia. Scale: Specimen Size 0.5x1 cm. © Diederik Visser
Joseite-B: Bi4(S,Te)3
Comments: Steel gray, metallic, platy Joseite-β in quartz matrix. Location: Jakub Mine, Kasejovice, Bohemia, Czech Republic. Scale: Picture Size 5x2 cm. © Diederik Visser
Kalborsite: K6Al4Si6BO20(OH)4Cl
Comments: White crystals of kalborsite rimming eudialyte. Location: Mt. Rasvumchorr, Chibiny, Kola Peninsula, Russia. Scale: FOV Est 4 mm. © Diederik Visser
Kamchatkite: KCu++3OCl(SO4)2
Comments: Greenish brown crystals of kamchatkite in sealed plastic box. Location: Main Fracture Eruption (1975-1976), Tolbachik Volcano, Kamchatka, Russia. Scale: Specimen Size 2x3 cm. © Diederik Visser
Kapustinite: Na5.5Mn0.25ZrSi6O16(OH)2
Comments: Purple-red kapustinite partly covered with white powdery newly formed thermonatrite with violet ussingite. Location: Palitra Pegmatite, Kedykverpakhk Mt., Lovozero, Kola, Russia. Scale: Specimen Size 0.3x1.2 cm. © Diederik Visser
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
Kazakovite: Na6Mn++TiSi6O18
Comments: Yellow brown transparent kazakovite grains in matrix. Location: Mt. Rasvumchorr, Chibiny, Kola, Russia. Scale: Not Given. © Diederik Visser
Keldyshite: Na2-xHxZrSi2O7·n(H2O)
Comments: Gray-white chalk-like keldyshite in and on matrix. Location: Langdalen, Vestfold, Norway. Scale: Specimen Size 5x7 cm. © Diederik Visser
Kelyanite: (Hg+2)6(SbO6)BrCl2
Comments: B&W BSE image of an epoxy grain mount of kelyanite (1) and calomel (2) fragment. Location: Kelyan Sb-Hg mine, Buryatia, Siberia, Russia. Scale: See Image. © Diederik Visser
Kharaelakhite: (Pt,Cu,Pb,Fe,Ni)9S8
Comments: B&W BSE polished section image of a kharaelakhite (Xar) reaction rim on cooperate (Cup) and braggite (Br). Location: Komsolmol'skii mine, Talnakh Cu-Ni deposit, Norilsk district, Krasnoyarsk Territory, Siberia, Russia. Scale: Scale bar 20 µm. © Diederik Visser