Why is color alone not a reliable means of identifying minerals?

The iron in quartz is a chemical impurity because it is not normally found in quartz. Many minerals are colored by chemical impurities. Other factors, such as weathering, can also affect a mineral's color. ... Because color alone is unreliable, geologists identify minerals by several traits.

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there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: