Rough black tourmaline with mica is in a natural form. Generally we carry rough black tourmaline with mica specimens that are 7 - 25 cm.
Black is one of the many colours of tourmaline. However, since it is pleochroic, it might be green when viewed along a different axis. This crystal is also piezoelectric which means that through mechanical action an electric pulse is formed, similar to quartz. Micas which are sheet silicates that form in distinct layers are fairly light and relatively soft and the sheets and flakes of mica are flexible.
As a healing stone, black tourmaline is said to protect against cell phones and radiation. It grounds energy, clears negative thoughts and increases physical vitality. It is said to strengthen the immune system, treat arthritis and provide pain relief. Mica also clears electromagnetic pollution. This stone insists on being for the highest good. It balances the heart with the mind.