Question

drag the missing word into place
it could be yellow, purple, red, green or black.
but the
thats the color of the minerals powder.

Explanation:

In mineralogy, the streak of a mineral refers to the color of its powder. Luster relates to how shiny a mineral is, and hardness is about its resistance to scratching. The context mentions "the color of the mineral's powder", which directly points to the term "streak".

Answer:

streak