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This crocoite is a great example of what gives minerals their color. Some minerals are always the same color. Others, such as quartz, vary in color depending on impurities, inclusions, or defects in their atomic structure. Crocoite's color, always orange or reddish-orange, comes from chromium, a valuable metal first extracted from this rare mineral. The best crocoite in the world is found in Tasmania, where it was once mined for lead.