| 0 | ICE (Hydrogen Oxide) |
| 0 | IDOCRASE (alternate name of Vesuvianite) |
| Sale! 3 | ILVAITE (Calcium Iron Silicate Hydroxide) |
| 0 | ILMENITE (Iron Titanium Oxide) |
| 0 | INDICOLITE (blue variety of Elbaite tourmaline) |
| Sale! 1 | INESITE (Hydrated Calcium Manganese Silicate Hydroxide) |
| 0 | IOLITE (variety of Cordierite) |
| Sale! 13 | IRON (Fe) |