From: poutnik4REMOVEnntp@gmailCAPITALS.com.INVALID   
      
   Oumati Asami  Wrote in message:   
   > Many copper salts are blue. So, they can't be told by color.I have a piece   
   of copper in the filter of a swimming pool. After a while, the surface turned   
   blue. It can't be copper chloride because copper chloride is very soluble in   
   water. What could it    
   be?   
      
   It could be a basic copper carbonate.   
   2 minerals are based on it, malachite and azurite.   
      
   https://en.wikipedia.org/wiki/Malachite   
   https://en.wikipedia.org/wiki/Azurite   
      
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   Poutnik ( the Wanderer )   
      
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