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What chemicals give rocks their colors?

For example, what makes purple rocks purple, pink rocks pink, etc.

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JamesGrantSmith profile image61

James Grant Smith (JamesGrantSmith) says

3 years ago
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tom hellert profile image61

tom hellert says

4 years ago
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    Rachel Vega (theclevercat) 4 years ago

    Thanks, Tom! I found the rocks pictured at low tide in a bay in Maine and was fascinated at their coloring.