When there are no impurities, pure quartz is water-clear and often referred to as “rock crystal”. Impurities can give transparent quartz beautiful hues, such as yellowish citrine (iron ...

Evidence for the use of rock crystal - a rare type of perfectly transparent quartz which forms in large hexagonal gems - has occasionally been found at prehistoric sites in the British Isles, but ...

When energy levels hit rock bottom, crystals can offer a sparkling boost ... especially when mental fatigue strikes. Clear Quartz: The Energy Amplifier Clear quartz acts as an all-rounder ...