( n. )
A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color. It is a silicate of iron, manganese, and lime.
( n. )
A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color. It is a silicate of iron, manganese, and lime.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012