Beautiful Dyed Quartz Geodes ( 2 ) - Los Catalanes, Uruguay Dyed to perfection, stunning pieces These wonderful Geodes have been cracked open to reveal the hollow interior filled with amazing shimmering Quartz crystals. Though both Quartz crystals and the geode are natural, the geode has been dyed to create the blue color in the Quartz crystals. Quartz is a chemical compound consisting of one part silicon and two parts oxygen. It is silicon dioxide (SiO2). It is the most abundant mineral found at Earth's surface and its unique properties make it one of the most useful natural substances. Formula: SiO2; Color: Colorless through various colors to black; Mohs scale hardness: 7; ** SEE VIDEO ( IF AVAILABLE ) FOR FULL EFFECTS ** ** WE HAVE MANY BEAUTIFUL MINERALSPECIMENS FROM THE USA AROUND THE GLOBE ** MOST ARE FROM OUR VARIOUS TRIPS ** ** SEE MY STORE ** ** OUR GOAL IS TO MAKE COLLECTING FUN AFFORDABLE FOR ALL WITH GREAT LOW PRICING * ITEM # 324