Question

a mineral breaks into cubes when struck with a rock hammer. it also leaves a red trail when scraped against an unglazed porcelain plate.
which of the minerals properties are being measured?
choose the two correct answers.
□ cleavage
□ streak
□ color
□ hardness

Explanation:

• Cleavage is the tendency of a mineral to break along flat, smooth surfaces. Since the mineral breaks into cubes (a regular, flat - surfaced shape), cleavage is being measured.
• Streak is the color of the powder of a mineral. When the mineral is scraped against an unglazed porcelain plate and leaves a red trail (powder), streak is being measured. Color is the visible hue of the mineral in its natural state, and hardness is measured by scratching against other materials (not just leaving a powder trail).

Answer:

cleavage, streak