Material Index
| Name | Formula | Classifications | Members | Image | Lines | Spectra | Techniques | Tags |
|---|---|---|---|---|---|---|---|---|
| Insizwaite | PtBi2 | Pyrite (group) | — | 0 | 0 | — | Mineral | |
| Iodargyrite | AgI | — | — | 1 | 0 | — | Mineral, Halide | |
| Iodine | I | — | — | 9 | 0 | — | Element | |
| Iridium | Ir | — | — | 15 | 2 | SXES | Metal , Mineral , Element | |
| Iriginite | (UO2)MoVI2O7·3H2O | Uranyl molybdate | — | 3 | 0 | — | Uranyl , Mineral, Hydrated , Molybdate | |
| Iron | Fe | — | — | 12 | 2 | SXES | Metal , Mineral , Element | |
| Iron oxide/hydroxide | Fe(O,OH)x | — | Lepidocrocite, Feroxyhyte, Iron(II) hydroxide, Bernalite, Iron(III) oxide, Iron(II,III) oxide, Iron(II) oxide, Ferrihydrite, Goethite, Maghemite | 2 | 0 | — | Group , Informal | |
| Iron phosphide | Fe3P, FexP | — | — | 0 | 1 | CL | Compound , Phosphide | |
| Iron(II) hydroxide | Fe(OH)2 | Iron oxide/hydroxide | Amakinite | 1 | 0 | — | Hydroxide, Compound | |
| Iron(II) oxide | FeO | Iron oxide/hydroxide | Wüstite | 0 | 0 | — | Compound , Simple oxide | |
| Iron(II,III) oxide | Fe3O4 | Iron oxide/hydroxide | Magnetite | 0 | 0 | — | Compound , Mixed oxide | |
| Iron(III) oxide | Fe2O3 | Iron oxide/hydroxide | Hematite, Luogufengite | 0 | 0 | — | Simple oxide , Compound | |
| Ishiharaite | (Cu,Ga,Fe,In,Zn)S | Sphalerite (group) | — | 0 | 0 | — | Mineral, Sulphide | |
| Itsiite | Ba2Ca(BSi2O7)2 | Hyalotekite (group) | — | 0 | 0 | — | Mineral, Borosilicate | |
| Jacobsite | MnIIFeIII2O4 | Spinel (subgroup) | — | 0 | 0 | — | Mineral |