The easiest way to observe the streak of a mineral is to:
a. rub some of the mineral against a porcelain tile.
When you rub a mineral against a porcelain tile, it leaves a streak of powder behind. This streak color can be different from the color of the mineral itself. By observing the streak color, you can identify the mineral more accurately. This method is widely used in mineral identification because the streak color is often consistent and helps distinguish between different minerals.
