Definitions for: Cordierite

[n] a blue mineral of magnesium and iron and aluminum and silicon and oxygen; often used as a gemstone

Webster (1913) Definition: Cor"di*er*ite (k?r"d?-?r-?t), n. [Named after the
geologist Cordier.] (Min.)
See Iolite.

See Also: mineral, water sapphire