This is utterly magnificent! 
Pietersite is also known as Tempest Stone it is said to Create a Deep Spiritual Awareness

Pietersite is suggested to aid shamanic journeying, and is a stone that encourages your understanding that you are indeed a spiritual being, and helps you to access spiritual guidance, it also allows you to look further than where you are now, and enables you to see the bigger picture.

Thus utilizing of the power of your imagination to dream, and to create beautiful visions and ideals is very powerful.

Pietersite is a rare dark-gray or reddish breccia aggregate (rock made up of fragments embedded in a matrix), comprised mostly of hawk's eye and tiger's eye.

Pietersite slab