Why is the color of a mineral not a reliable test for the identity of the mineral?
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a. most minerals are colorless,
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b. minerals can change color based on small impurities.
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c. the color of a mineral tells you the iron content, but nothing else.

Option B.

Minerals can change color base on impurities.

Explanation:

Minerals are naturally occurring inorganic solids that have lattice structure and chemical composition.

Color alone is not reliable to identify minerals because minerals can change color base on impurities. Some minerals may have more than one color.

Minerals can best be identified base on their physical properties which is related to their chemical composition and bonding. Hardness, lustre, cleavage and how it's react to acid can be use to identify minerals.

i think it is true in my reasonment ..