Kyanite or Disthene is a translucent pale to sapphire blue mineral. The name Kyanite is derived from the Greek word “kyanos” which means deep blue, while the name Disthene is derived from its anisotropism, i.e. its property of exhibiting variable hardness depending on its orientation. Its hardness varies from 4.5 to 7 on the Mohs scale, depending on the direction it is processed.
Tourmaline comprises a large range of sodium minerals and is available in a plethora of colours. This mineral is hard and transparent and very resistant to oxidation. Its name is derived from the Sinhalese word “tourmali”, which means “mixed”. It is supposed to strengthen the nervous system. Tourmalines are encountered across all geological formations in America and Indonesia.
The black tourmaline guards against negative energy.