Natural quartz is a non-porous, crystalline, silicon dioxide mineral. Ranking 7 on the Mohs Hardness Scale, it is very resistant to scratching and other forms of physical and chemical erosion. One of the most interesting properties of quartz is the fact that it’s a piezoelectrical material – it can generate internal electrical charge when mechanical stress is applied to it. Thanks to this amazing property, it is used as an oscillator to keep consistent time in watches and can be programmed to store information. Many cultures view quartz as one of the more powerful natural healing crystals.