Tourmaline Tourmalines are precious stones displaying a unique splendour of colours. According to an ancient Egyptian legend this is the result of the fact that on the long way from the Earths heart up towards the sun, Tourmaline travelled along a rainbow. And on its way it collected all the colours of the rainbow. This is why nowadays it is called the "Rainbow gemstone".
Prehnite With its bright, almost luminescent green coloring Prehnite is an attractive mineral that can have a very good luster. It forms in cavities in basaltic rocks. Prehnite is a hydrous, calcium-aluminum-silicate mineral, which is commonly found in cavities and "pillows" and along fractures of basalt and diabase rock.