It leaves a white streak.
When you say Barium it refers to element Ba, Barium has a Mineral called Baryte BaSO4, which have white streak!
what is the specific gravity,luster,transparency,streak,cleavage,and fracture of barium?
White.
green
yellow
Mica has a white streak.
there is no name for the color, but there is the "streak" of a mineral, meaning the color of its streak.
Black to a brownish black
A streak that has color or no color.
The color of barium in flame is pale green.
The color of a mineral in powdered form is called the streak color.