What is the streak test used for?

1 Answer
Oct 23, 2015

clue in identifying minerals .


The color of the powder left by a mineral when it is rubbed against a hard, rough surface is called streak. Streak color is use to identify minerals that have a characteristic streak color and are fairly soft. Even though the mineral color may vary, its streak is always the same.

REMEMBER: Streak color is often different from the color of the mineral itself.