mineral—A naturally occurring, homogeneous inorganic solid substance having a definite chemical composition and characteristic crystalline structure, color, and hardness. Minerals are chemical compounds

rock
—Relatively hard, naturally formed mineral or petrified matter; stone; a naturally formed aggregate of mineral matter constituting a significant part of the earth's crust. Rocks consist of one or more minerals.

The mineral composition of a rock reflects the physical environment and geologic history where a rock formed.
 
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