Also called cordierite, dichroite and water sapphire
Iolite is named after it's violet color. The other names come form the French mineralogist, Cordier; and from it's similarity to sapphire. Greasy, virtreous luster care must be taken when cutting because of the strong pleochroism. Stones must not be too thick. Main deposits ate in Burma, Brazil, Sir Lanka, India, and Malagasy Republic.