Quartz on Datolite     Charcas, San Luis Potosi, Mexico.  Large crystals compose this light green, with casts of yellow, specimen.  6.6 x 4.5 x 3 cm slightly domical specimen with a druse of quartz on select areas of very large (to 4 cm each) datolite crystals.  Attractive green, transparent/ translucent crystals.  No damage and fantastic in-hand.   $45