Click on thumbnails for a larger image. Please be patient since some of these pages of thumbnail images take some time to load. These mineral photos are copyrighted by their owners and may not be used without permission.
Juanite: Ca10Mg4Al2Si11O39·4(H2O) (?)
Comments: Light greenish translucent grains of juanite with dark magnetite. Location: Iron Hill, Gunnison Co., Colorado, USA. Scale: Picture size 1 cm. © Tom Loomis / Dakota Matrix
Julgoldite-(Fe+++): Ca2Fe+++(Fe+++,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O)
Comments: Black, prismatic micro-crystals of julgoldite-(Fe+++) in white apophyllite. Location: Langban mine, Filipstad , Värmland, Sweden. Scale: 5x3mm. © Tom Loomis / Dakota Matrix
Junitoite: CaZn2Si2O7·(H2O)
Comments: Clear, platy, flat lying crystals of junitoite (red marker) to 2mm associated with lavender smectite. Location: Christmas mine, Gila Co., Arizona, USA. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Junoite: Pb3Cu2Bi8(S,Se)16
Comments: Solid crystalline mass of dark gray, metallic junoite. Partially sawed indicating analytical verification. Location: 700 level, Juno Mine, Tennant Creek, Northern Territory, Australia. Scale: 3x2x2cm. © Tom Loomis / Dakota Matrix
Kalifersite: (K,Na)5Fe+++7Si20O50(OH)6·12(H2O)
Comments: Brownish-red crystalline granular aggregates of kalifersite in rock matrix composed of fibers to 5mm. Location: Mt. Rasvumchorr, Khibiny massif, Kola Peninsula, Russia. Scale: Specimen size 3.5 x 2 x 1.5cm. © Tom Loomis / Dakota Matrix
Kamotoite-(Y): (Y,Nd,Gd)2U++++++4(CO3)3O12·14.5(H2O)
Comments: Bright yellow, feather-like kamotoite-(Y) crystal habits. Location: Kamoto mine, Kolwezi, Shaba, Democratic Republic of the Congo. Scale: Picture size 2 cm. © Tom Loomis / Dakota Matrix
Karibibite: Fe+++2As+++4(O,OH)9
Comments: Orange yellow, radial sprays of karibibite on löllingite to 0.75mm. Location: Galileia, Minas Gerais, Brazil. Scale: picture size 5 mm. © Tom Loomis / Dakota Matrix
Kentrolite: Pb2Mn+++2Si2O9
Comments: Brownish red grains of kentrolite in matrix. Location: Langban mine, Varmland, Sweden. Scale: Picture size 5 mm. © Tom Loomis / Dakota Matrix
Khaidarkanite: Na0.34Cu4Al3(OH)14F3·2(H2O)
Comments: Sky blue acicular radial sprays of khaidarkanite. Location: Khaidarkan, Kyrgizia. Scale: Crystal size 1 mm. © Tom Loomis / Dakota Matrix
Kinoite: Ca2Cu2Si3O8(OH)4
Comments: Kinoite crystals as single tabular or platy blue crystals to about 0.3mm and as fan-like sprays. The crystals exhibit striations, a key to distinguishing it from stringhamite. Location: Christmas mine, Gila Co., Arizona, USA. Scale: Picture size 3 mm. © Tom Loomis / Dakota Matrix