iolite


i·o·lite

I5242650 (ī′ə-līt′)n. A clear, blue or blue-violet cordierite often used as a gemstone. Also called water sapphire.
[Greek ion, violet; see iodine + -lite (on the model of German Iolith : Greek ion + -lith, -lite, -lith).]

iolite

(ˈaɪəˌlaɪt) n (Minerals) another name for cordierite[C19: from Greek ion a violet + -lite]