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Isocubanite: CuFe2S3 Isochalcopyrite: Cu8Fe9S16
Comments: Polished section showing isocubanite (formerly isochalcopyrite) with exsolved chalcopyrite infilling and replacing cross-bedded turbiditic hydrothermally altered sandstone. Location: Unit VI, Deep Copper Zone, Bent Hill Massive Sulfide Deposit, Middle Valley, Northern Juan de Fuca Ridge. Scale: See Image. © National Resouces of Canada
Isoferroplatinum: (Pt,Pd)3(Fe,Cu) Cuproiridsite: CuIr2S4
Comments: Gray equant crystal of cuproiridsite in light gray isoferroplatinum. Polished section (from microprobe analysis) in reflected light. Location: Konder Mine, Konder alkaline-ultrabasic massif, Aldan shield, Saha (Sakha) Republic (Yakutia), Eastern-Siberian Region, Russia. Scale: Picture size 0.14 mm. © Thomas Witzke / Abraxas-Verlag
Isoferroplatinum: (Pt,Pd)3(Fe,Cu)
Comments: Irregularly shaped silver metallic nugget of isoferroplatinum with minor chromite. Location: Fox Gulch, Goodnews Bay. Alaska, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Isoferroplatinum: (Pt,Pd)3(Fe,Cu) Ruthenium: (Ru,Ir,Os)
Comments: Scanning electron micrograph of polished section of ruthenium nugget with isoferroplatinum inclusions. Location: Miass River, Chelyabinsk District, Southern Urals, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Isokite: CaMg(PO4)F
Comments: Pale brownish to brown isokite in quartz. Location: Sauberg Mine, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 7 mm. © Thomas Witzke / Abraxas-Verlag
Isomertieite: Pd11Sb2As2 Arsenopalladinite: Pd8(As,Sb)3 Gold: Au Bornite: Cu5FeS4
Comments: Light grayish grain of intimately intergrown isomertieite and arsenopalladinite (in the center of the picture), with pale yellow gold and brownish to violet bornite. Polished section (from microprobe analysis) in reflected light. Location: Noril'sk, Putoran Mts, Taymyrskiy Autonomous Okrug, Eastern-Siberian Region, Russia. Scale: Picture size 0.1 mm. © Thomas Witzke / Abraxas-Verlag
Isovite: (Cr,Fe)23C6
Comments: Dark gray metallic grain of isovite. Location: Verkhneivinsk, Sverdlovskaya Oblast', Urals Region, Russia. Scale: Grain size 0.7 mm. © Thomas Witzke / Abraxas-Verlag
Iwakiite: Mn++(Fe+++,Mn+++)2O4
Comments: Back fine-grained granular iwakiite in pink rhodonite. Location: Gazaisho Mine, Iwaki, Fukushima, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Iwashiroite-(Y): YTaO4
Comments: Polished section of an aggregate of minute iwashiroite-(Y) crystals. Some of the aggregates appear dark blue owing to internal reflections. Location: Suishoyama, Kawamata Town, Fukushima Prefecture, Japan. (Journal of Mineralogical and Petrological Sciences, v101:170). Scale: See Image. © JMPS
Ixiolite: (Ta,Nb,Sn,Mn++,Fe++)O2
Comments: Hemispherical crystalline aggregate of ixiolite. Location: Muiane mine, Zambesia, Mozambique. Scale: Specimen size 1.3 cm. © John Veevaert
Izoklakeite: Pb27(Cu,Fe)2(Sb,Bi)19S57
Comments: Prismatic metallic gray microcrystal of izoklakeite (mounted on paper). Location: Vena Mine, Bergslagen, Orebro, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jachymovite: (UO2)8(SO4)(OH)14·13(H2O)
Comments: Yellow crystals of jáchymovite. Location: Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag
Jacobsite: (Mn++,Fe++,Mg)(Fe+++,Mn+++)2O4 Barite: BaSO4
Comments: Sharp, octahedral crystals of Jacobsite on a bladed barite matrix. Location: N' Chwaning II Mine, Kuruman, South Africa. Scale: 3x2.5x1.9 cm. © Isaias Casanova / IC Minerals
Jacobsite: (Mn++,Fe++,Mg)(Fe+++,Mn+++)2O4 Ganomalite: Pb9Ca5Mn++Si9O33
Comments: White crystalline ganomalite with dark granular jacobsite. Location: Jacobsberg, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jadarite: LiNaB3SiO7(OH)
Comments: Quarter section of drill core sample of white, massive jardarite. Location: Jadar Basin, Serbia.. Scale: Sample Size 3 cm. © Natrual History Museum
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
Jadeite: Na(Al,Fe+++)Si2O6 Stronalsite: SrNa2Al4Si4O16
Comments: White stronalsite veinlets in massive pale green jadeite. Location: Ohasa, Okayama, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jagoite: (Pb,Na,Ca)3(Fe+++,Mg)Si3O10(Cl,OH)
Comments: Yellow crystalline fragment of jagoite in hausmannite. Location: Langban, Varmland, Sweden. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jagowerite: BaAl2(PO4)2(OH)2
Comments: Pale green to white massive jagowerite. Location: Hess River, Yukon Territory, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jagowerite: BaAl2(PO4)2(OH)2 Penikisite: BaMg2Al2(PO4)3(OH)3
Comments: Light green crystal of jagowerite intergrown with darker green penikisite in a tetrahedrite (black) and white quartz matrix. Location: From quartz veins cutting clays 26 km N of Hess River, Yukon Territory, Canada. Scale: Sample size 2x1 cm. © Dave Barthelmy