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Jamesonite: Pb4FeSb6S14
Comments: Metallic, hair-like, crystals of jamesonite on matrix. Location: Baie Sprie (Felsobanya), Maraures, Romania. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Joaquinite-(Ce): NaFe++Ba2Ce2(Ti,Nb)2[Si4O12]2O2(OH,F)·(H2O)
Comments: Brown crystal of joaquinite-(Ce). Location: Benitoite Gem mine, San Benito County, California, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Johannite: Cu(UO2)2(SO4)2(OH)2·8(H2O)
Comments: Green colored johannite crystals. Location: Happy Jack mine, White Canyon, San Juan County, Utah, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Kamotoite-(Y): (Y,Nd,Gd)2U++++++4(CO3)3O12·14.5(H2O)
Comments: Bright greenish yellow kamotoite-(Y) crystals. Location: Kamoto mine, Kolwezi, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Kasolite: Pb(UO2)SiO4·(H2O)
Comments: Golden yellow crystals of kasolite. Location: Shinkolobwe mine, Tatara, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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
Kermesite: Sb2S2O
Comments: Reddish brown radiating spray of kermesite crystals on matrix. Location: Pezinok (Pernek), near Bratislava, Solvakia. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Kidwellite: Na(Fe+++,Cu)9+x(PO4)6(OH)11·3(H2O)
Comments: Yellowish green columnar aggregates of kidwellite crystals. Location: Indian Mountain, Cherokee County, Alabama, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Kimzeyite: Ca3(Zr,Ti)2(Si,Al,Fe+++)3O12
Comments: Black isometric crystal of kimzeyite garnet. Location: Kimzey pit, Magnet Cove, Hot Spring County, Arkansas, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Kingsmountite: (Ca,Mn++)4(Fe++,Mn++)Al4(PO4)6(OH)4·12(H2O)
Comments: White, radial spray of kingsmountite crystals. Location: Kings Mountain, Cleveland County, North Carolina, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals