Question

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

Explanation:

When molten materials cool slowly, atoms have more time to arrange into larger, well-formed crystals. Rapid cooling traps atoms before they can organize into large structures, resulting in very small or even microscopic crystals. Color, luster, and crystal shape are primarily determined by the mineral's chemical composition and internal atomic structure, not cooling rate.

Answer:

crystal size