Used to determine a mineral's colour in powder form, or to identify the mineral content of a rock.
The "streak test" is a method used to determine the colour of a mineral in powdered form. The colour of a mineral's powder is often a very important property for identifying the mineral.
The streak test is done by scraping a specimen of the mineral across a piece of unglazed porcelain known as a "streak plate." This can produce a small amount of powdered mineral on the surface of the plate. The powder colour of that mineral known as its "streak."
Great for geology and earth science classrooms. Streak plates can be cleaned and reused again and again.