Amazing Quartz cabochon with inclusions of Covellite crystals. This is the famous Pink Fire Quartz.Pink Fire is possibly the rarest and more exciting between the Quartz gemstones. The inclusions are tiny crystals of Covellite, a rare copper sulfide (CuS). The amazing pink shine is visible just from few angles because the Covellite crystals are iso-oriented in a epitactic growth over a phantom face of the Quartz crystal. The phenomenon is similar to the shiller effect of sunstone, but has been proposed as a new optical effect. Hard to find piece for high level collector.