Mineral Specimen Images (I)

Ishikawaite: (U,Fe,Y,Ca)(Nb,Ta)O4 (?)

Comments: Blocky, metamict crystals of ishikawaite.
Location: Spinelli Quarry (Spinelli prospect), South Glastonbury, Hartford Co., Connecticut, USA. Scale: 15x15x10 mm.
© John Betts - Fine Minerals

Isochalcopyrite: Cu8Fe9S16  
Isocubanite: CuFe2S3

Comments: SEM image of an aggregate of idiomorphic grains of isocubanite (formerly known as isochalcopyrite) associated with minor pyrite.
Location: Submarine sulphide deposits of the East Pacific Rise (EPR) and the Red Sea. Scale: See Image.
© Mineralogical Magazine

Isochalcopyrite: Cu8Fe9S16  
Isocubanite: CuFe2S3

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

Isocubanite: CuFe2S3  
Isochalcopyrite: Cu8Fe9S16

Comments: SEM image of an aggregate of idiomorphic grains of isocubanite (formerly known as isochalcopyrite) associated with minor pyrite.
Location: Submarine sulphide deposits of the East Pacific Rise (EPR) and the Red Sea. Scale: See Image.
© Mineralogical Magazine

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