Albite

A usually milky white variety of plagioclase, NaAlSi₃O₈, found in various plutonic rocks, especially granite and syenite, often with twin crystals.

Al"bite (#), n. [L. albus white.] Min.

A mineral of the feldspar family, triclinic in crystallization, and in composition a silicate of alumina and soda. It is a common constituent of granite and of various igneous rocks. See Feldspar.

© Webster 1913.