Black Tourmaline crystal is a powerful stone for protection against negative energy of all kinds including psychic protection and EMF protection. It is also a strong spiritual grounding stone. Many people and I am among this group, believe this is the best protection stone that you can use.
Quartz is one of the most well-known minerals on earth. It occurs in basically all mineral environments and is the important constituent of many rocks. Quartz is also the most varied of all minerals, occurring in all different forms, habits, and colours. There are more variety of names given to Quartz than any other mineral.