This rock is pink because it is made out of limestone that has been stained deliberately. The blue is epoxy, which fills all of the open spaces in the rock. The black is solidified oil residue. The visible area is 2.5 mm wide. This used to be a pile of shells, but most of them have been dissolved away. Most of what's left is cement that grew in between the shells before they dissolved.
From about 11,000 feet underground.
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