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Jadeite: Na(Al,Fe+++)Si2O6
Comments: Fibrous crystals of Jadeite. Location: Russian River, near Cloverdale, Mendocino County, California, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Jahnsite-(CaMnMg): CaMnMg2Fe+++2(PO4)4(OH)2·8(H2O)
Comments: Brown, striated, transparent crystals of jahnsite-(CaMnMg) on matrix. Location: Tip Top mine, Custer, Custer County, South Dakota, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
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) Frondelite: Mn++Fe+++4(PO4)3(OH)5
Comments: Root beer colored crystals of frondelite and white kidwellite sticks on matrix. Location: Sapucaia, Minas Gerais, Brazil. 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
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
Krennerite: AuTe2
Comments: Metallic krennerite crystals on quartz. Location: Emperor mine, Vatukoula, Viti Levu, Fiji. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Kupletskite: K2Na(Mn,Fe++)7(Ti,Nb)2Si8O26(OH)4F
Comments: Bronze-colored stellate crystalline spray of kupletskite on white orthoclase. Location: 3M quarry, Little Rock, Pulaski County, Arkansas, USA. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Kurilite: (Ag,Au)2(Te,Se,S) Hessite: Ag2Te
Comments: Metallic crystal of hessite on matrix. Hessite is also known as kurilite. Location: Botes, Zlatna, Transylvania, Romania. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Lanarkite: Pb2(SO4)O
Comments: White, acicular spray of lanarkite on matrix. Location: Meadowfoot smelter, Wanlockhead, Lanarkshire, Scotland. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Langite: Cu4(SO4)(OH)6·2(H2O)
Comments: Bluish, tabular blades of twinned langite crystals on matrix. Location: Mollau, France. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Lanthanite-(Ce): (Ce,La)2(CO3)3·8(H2O)
Comments: Brownish, square crystals of lanthanite-(Ce) ?. Location: Curitiba, Parana, Brazil. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals