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earth science Maturity 7-9 Next article →

Some rocks have special bits in them. This one can be blue or green. It can even glow in the dark. You can find it in many places. It is a rare find. Do you like bright colors?

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A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.