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Idaite: Cu5FeS6
Comments: Deep blue metallic idaite in milky quartz. Location: Winston, Sierra County, New Mexico, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Idrialite: C22H14
Comments: Yellow platy crystalline idrialite on matrix. Location: Skaggs Springs, Sonoma County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ilmajokite: (Na,Ce,La,Ba)2TiSi3O5(OH)10·n(H2O) (?)
Comments: Opaque dull yellow ilmajokite in syenite matrix. Location: valley of Ilmajok River, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Ilmenorutile: (Ti,Nb,Fe+++)O2
Comments: Dark brown ilmenorutile crystal in matrix. Location: Iveland, Aust-Agder, Norway. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Imandrite: Na12Ca3Fe+++2Si12O36
Comments: Honey-yellow colored rims of imandrite surrounding grains of pink eudialyte. Location: Vuonnemiok River Valley, Khibiny Massif, Kola Peninsula, Russia. Scale: Picture Size 5 mm. © Jeff Weissman / Photographic Guide to Mineral Species
Imiterite: Ag2HgS2
Comments: Back metallic prismatic microcrystals of imiterite in white calcite. Location: Imiter Mine, Jbel Sarho, Anti-Atlas Region, Morocco. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Imogolite: Al2SiO3(OH)4
Comments: Tan powdery massive imogolite. Location: Fukaiwa, Nanuma-shi, Tochigi, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Inderborite: CaMg[B3O3(OH)5]2·6(H2O)
Comments: Translucent glassy crystalline inderborite. Location: Lake Inder, Atyrau, Kazakhstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Inderite: MgB3O3(OH)5·5(H2O)
Comments: Prismatic colorless crystal of inderite. Location: Boron, Kern County, California, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Indialite: Mg2Al4Si5O18
Comments: Gray glassy crystalline indialite in rock. Location: Daimonji yama, Kyoto-shi, Kyoto, Japan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species