0ICE (Hydrogen Oxide)
0IDOCRASE (alternate name of Vesuvianite)
0IGNEOUS (rocks that solidified from magma)
0ILVAITE (Calcium Iron Silicate Hydroxide)
0ILMENITE (Iron Titanium Oxide)
0INDICOLITE (blue variety of Elbaite tourmaline)
0INESITE (Hydrated Calcium Manganese Silicate Hydroxide)
0IOLITE (variety of Cordierite)
4IRON (Fe)