2 x 2 Streak Plate
$0.45 CAD / ea
DescriptionThe "streak test" is a way of determining the color of a mineral in powdered form. A specimen of the mineral is placed against a piece of unglazed porcelain plate (known as a streak plate) and scraped across the surface of the plate. If a powdered residue is left behind, the color of that powder is known as the mineral's "streak color." The observer must determine if the mark left on the streak plate is a genuine "powder" or if it is composed of granules or broken fragments.