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this is a two coloured crystal (?) - from the photo is it possible to identify it?
Hmmm - I can't see much by way of crystal habit.
The paler colour seems almost painted-on; it may represent a different state of oxidation or hydration.
Since you don't give a clue on its origin, I can suggest only obvious things like azurite, lapis lazuli, sodalite, copper sulphate.