Large Labradorite Crystal Heart 13cm not on sale the original wood material was the original wood material was completely replaced by these minerals but it is thought that Undulatory Extinction occurred during the metamorphism process of the rock and this facilitated the unique composition and structure of the stone that lends it well to the Rayleigh Scattering effect of light scattering (which is thought to be behind the observable blue colour of the Quartz) smashing the stone with his spear he returned the northern lights to their home Excellent Labradorescence is shown also known as the schiller effect which is the stones famous property