1. 
   Calcedon
   Cal'ce·don noun [ See Chalcedony .] A foul vein, like chalcedony, in some precious stones.
   Found op http://www.encyclo.co.uk/webster/C/7
   
   
2. 
   Calcedon
   • (n.) A foul vein, like chalcedony, in some precious stones.
   Found op http://thinkexist.com/dictionary/meaning/calcedon/
   
   
3. 
   calcedon
   1) A foul vein, like chalcedony, in some precious stones
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/calcedon/1
   
   

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