Question

if I drag a mineral along a ceramic tile so that it leaves behind some dust of itself, what am I testing for?

Answer 1

When a mineral is rubbed firmly across an unglazed tile of white porcelain (a streak plate), it leaves a line of powder, called the streak. The color of the streak varies from mineral to mineral. However, different colored samples of the same mineral always leave the same color streak.

HOPE THIS HELPS YOU ❤️