Answer:
D. streak plate
Step-by-step explanation:
A geologist use a streak plate to find the color of a mineral in its powdererd form.
To determine the color of a mineral, the geologist uses a technique called color of the stripe or footprint.
This technique involves taking the mineral and spreading a part of it on a plate to determine its color.
This is a mineral identification technique since its composition can be determined according to its colors.