from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The clear variety of cordierite.
from the GNU version of the Collaborative International Dictionary of English
- n. A silicate of alumina, iron, and magnesia, having a bright blue color and vitreous luster; cordierite. It is remarkable for its dichroism, and is also called dichroite. A variety called Caribbean iolite has a lighter blue color.
from The Century Dictionary and Cyclopedia
- n. A silicate of magnesium, aluminium, and iron, a mineral of a violet-blue color with a shade of purple or black.
From Ancient Greek ἴον ("violet") + -lite. (Wiktionary)