- a mineral, lithium aluminum silicate, LiAlSi2O6, occurring in prismatic crystals, transparent varieties being used as gems.
- a greyish-white, green, or lilac pyroxene mineral consisting of lithium aluminium silicate in monoclinic crystalline form. It is an important ore of lithium and is used in the manufacture of glass and ceramics and as a gemstone. Formula: LiAlSi 2 O 6
