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Innelite: (Na,Mg,Ca)2(Ba,K)4Ti3(Si2O7)2(SO4)2(OH,F)
Comments: Yellow crystalline granular innelite. Location: Inagli, Aldan, Republic of Sakha, Siberia, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Irhtemite: Ca4Mg(AsO3OH)2(AsO4)2·4(H2O)
Comments: Pink acicular divergent microcrystals of irhtemite on matrix. Location: Irhtem Mine, near Bou-Azzer, Ouarzazate, Morocco. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Iridium: (Ir,Os,Ru,Pt)
Comments: Silvery metallic crystalline iridium micrograin and irregular nuggets. Location: Fox Gulch, Goodnews Bay, Alaska, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
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
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
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
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
Jalpaite: Ag3CuS2
Comments: Tarnished black lustrous masses of jalpaite in rock with blue chrysocolla. Location: La Mesa, Chihuahua, Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Jamborite: (Ni++,Ni+++,Fe)(OH)2(OH,S,(H2O))
Comments: Green coatings of jamborite on millerite filaments, in vug. Location: Halls Gap, Lincoln County, Kentucky, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species