( n. )
A mineral of a light indigo-blue color, occurring in small masses, or in monoclinic crystals; blue spar. It is a hydrous phosphate of alumina and magnesia.
( n. )
A mineral of a light indigo-blue color, occurring in small masses, or in monoclinic crystals; blue spar. It is a hydrous phosphate of alumina and magnesia.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012