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Jaskolskiite: Pb2+xCux(Sb,Bi)2-xS5, x=0.2
Comments: Silvery gray metallic granular jaskolskiite (mounted on paper). Location: Vena, Bergslagen, Orebro, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jeanbandyite: (Fe+++,Mn++)Sn++++(OH)6
Comments: Yellowish brown translucent microcrystal of jeanbandyite on mineral encrusted fluorite. Location: Mount Pleasant Tin Mine, New Brunswick, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jennite: Ca9Si6O18(OH)6·8H2O
Comments: Bright white fibrous jennite veinlet in rock. Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jeppeite: (K,Ba)2(Ti,Fe+++)6O13
Comments: Dark brown crystalline granular jeppeite. Location: Walgidee Hills, Western Australia, Australia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jimboite: Mn3B2O6
Comments: Dark red-brown crystalline jimboite veinlet in massive rhodochrosite. Location: Rito Mine, Azuma Mura, Seta-gun, Gumma, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jimthompsonite: (Mg,Fe++)5Si6O16(OH)2 Clinojimthompsonite: (Mg,Fe++)5Si6O16(OH)2
Comments: Pale green to white glassy crystalline fibrous clinojimthompsonite intergrown with jimthompsonite. Location: Chester, Windsor County, Vermont, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jixianite: Pb(W,Fe+++)2(O,OH)7 Cuprotungstite: Cu++3(WO4)2(OH)2
Comments: Reddish brown crystal druse of jixianite with minor tan cuprotungstite. Location: Apache Mine, Hidalgo County, New Mexico, USA. Scale: See Image. © Jeff Weissman / Photographic Guide to Mineral Species
Johnbaumite: Ca5(AsO4)3(OH) Tephroite: Mn2SiO4
Comments: Violet crystalline massive johnbaumite with brown tephroite. Location: Jacobsberg, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Johninnesite: Na2Mg4Mn++12(AsO4)2(Si12O35)(OH)6
Comments: Orange crystalline vein of johninnesite in manganese oxide matrix. Location: Ausserferrera, Val Ferrera, Graubundun, Switzerland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Johnwalkite: K(Mn++,Fe+++,Fe++)2(Nb,Ta)(PO4)2O2((H2O),OH)2
Comments: Fragment of translucent johnwalkite. Location: Champion Mine, Keystone District, Pennington Co., South Dakota, USA. Scale: Crystal length 1 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Jokokuite: MnSO4·5(H2O)
Comments: Pale pink stalactic mass of jokokuite. Location: Jokoku Mine, Haminokuni, Hokkaido, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jordanite: Pb14(As,Sb)6S23
Comments: Gray metallic crystalline jordanite in fine-grained marble. Location: Lengenbach Quarry, Binnental, Valais, Switzerland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Julienite: Na2Co++(SCN)4·8(H2O)
Comments: Bright blue nearly opaque prismatic micro crystal of julienite. Location: Chamibumba, near Kambove, Katanga, Shaba, Zaire. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jungite: Ca2Zn4Fe+++8(PO4)9(OH)9·16(H2O)
Comments: Translucent cleavage fragment of jungite. Location: Hagendorf, Bayern, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Junitoite: CaZn2Si2O7·(H2O)
Comments: Platy transparent junitoite crystal cluster lying flat on white limestone matrix. Location: Christmas Mine, near Hayden, Gila County, Arizona. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jurbanite: Al(SO4)(OH)·5(H2O)
Comments: White spherical crusts of jurbanite on matrix. Location: Le Cetine Mine, Siena, Tuscany, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kaersutite: NaCa2(Mg4Ti)Si6Al2O23(OH)2
Comments: Dark greenish-brown prismatic kaersutite crystals in matrix. Location: Nugssuaq, Umanak, Greenland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kafehydrocyanite: K4Fe++(CN)6·3(H2O)
Comments: Micro platy crystal of kafehydrocyanite. Location: Medvezhii Log, East Sayan Mountains, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kainite: MgSO4·KCl·3(H2O) Szaibelyite: MgBO2(OH)
Comments: pale violet granular kainite intermixed with white ascharite (szaibelyite). Location: Havesa, Empelde, Hannover, Niedersachsen, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Kaliborite: KHMg2B12O16(OH)10·4(H2O)
Comments: Translucent colorless crystal of kaliborite. Location: Lake Inder, Atyrau, Kazakhstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species