Question: Which is the most colorful rock that you have ever found? And where? Can you explain why it has those colors?

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  1. Colours in rocks are always related with the chemistry. Blueschists are blue because of the mineral glaucophane. Serpentinites are blue because of the serpentine. The most colourful rocks I have seen are skarn deposits, that happen in the contact of granites with limestones. Usually they produce a lot of different minerals, and in very small areas you can see deep blue, green, turquoise , red, orange, yellow, purple…