Chalcopyrite on Datolite     Charcas, San Luis Potosi, Mexico.  Big crystals to over 2 cm each compose this light green, with casts of yellow, specimen.  7.3 x 6 x 2.7 cm slightly domical specimen with a single metallic chalcopyrite.  Attractive green, transparent/ translucent crystals.  No damage and fantastic in-hand.   $60