The term "Optical Quartz" refers to a certain high level of purity, clarity and luster found very rarely in natural quartz crystals. Historically speaking, one can count the few discoveries made worldwide of natural, truly optical or "water-clear" quartz crystals that form in very specific geological conditions over millions of years. High in the mightiest of mountain ranges on our planet , the Himalayas. one of these historic discoveries has recently been made; quartz crystals with superb formation and undeniable optical clarity, unearthed at over 5000 meters. It is a true privilege to offer these prismatic and lively Optical quartz crystals.