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.

Explanation:

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answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.