Molten materials cool at different rates. which property of a mineral does this affect?
color
luster
crystal size
crystal shape

The correct aswer is crystal size.

Explanation:

Cooling rate affects to the size of the crystal formed by cooling a molten material. A fast cooling produces small crystals whereas slow cooling produces large crystals. At a slow cooling rate, crystals have more time to grow and therefore they are larger than those are formed at a fast cooling rate.

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