Question

1. a minerals resistance to being scratched

color
streak
hardness
cleavage/fracture
hardness
luster

Explanation:

• Color: Refers to the visual hue of the mineral, not its resistance to scratching.
• Streak: Is the color of the powder when the mineral is scraped, not related to scratch - resistance.
• Hardness: Specifically measures a mineral's resistance to being scratched. Mohs scale is used for this.
• Cleavage/fracture: Deals with how a mineral breaks (along planes or irregularly), not scratch - resistance.
• Luster: Describes the way light reflects off the mineral's surface, not its scratch - resistance.

Answer:

hardness