Color is a physical property of minerals. Different minerals have different colors. For example, gold—of course—is gold! However, color isn’t always a reliable property to identify a mineral. Fool’s gold, or pyrite, has a yellowish-gold color too. Some minerals come in different colors. Garnet, for example, can be red, green, yellow, orange, brown, pink, purple, gray or black. Some minerals come in all colors. Some minerals can also tarnish or oxidize, which means they can become discolored in certain environments. Silver and copper can both become discolored in this way. Silver tarnishes black, yellow or brown. Copper oxidizes green.
The color of a mineral
A
is always a result of oxidation.
B
is hard to use as an identifying property.
C
is an example of a chemical property.
D
is never the same color of another mineral.
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Explanation:
The color of a mineral is the first thing most people notice, but it can also be the least useful in identifying a mineral. Most minerals occur in more than one color. Fluorite can be clear, white, yellow, blue, purple, or green. The other properties, such as hardness, cleavage, and luster, must be used instead.
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