( n. )
The fine powder or mark yielded by a mineral when scratched or rubbed against a harder surface, the color of which is sometimes a distinguishing character.
( n. )
The fine powder or mark yielded by a mineral when scratched or rubbed against a harder surface, the color of which is sometimes a distinguishing character.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012