Question

A geologist is comparing the properties of different minerals. He rubs each one on a piece of white tile and observes the color of he power that is left behind. What type of test did he perform?

color


hardness


luster


streak

Answer 1

He performed a streak test, in which a piece of the mineral is rubbed across a piece of unglazed porcelain in order to determine the color of the mineral in powdered form.