Question

a minerals streak is _________.
choose one option
a always the same as its color
b the color it turns liquid when it dissolves
c the way it reflects light
d the color of its powder

Explanation:

Mineral streak is determined by rubbing the mineral on a streak plate (unglazed porcelain) to produce a powder. The color of this powder is the mineral's streak. Option A is incorrect as a mineral's color can vary due to impurities while streak is more consistent. Option B is wrong as it's not about dissolving into liquid. Option C describes luster (the way a mineral reflects light), not streak.

Answer:

D. the color of its powder