Zebradorite

Zebradorite   
Known as the “stone of cooperative effort”
The stone of the soul’s memory
Assists with retrieval of past life memories, soul purpose and soul contracts
Provides protection and transmutation of negative energy
Can bring peace during times of emotional or physical trauma 
Works with the solar plexus, as it can enhance courage, emotional strength and self-will
From Madagascar
 
These are priced by weight and not necessarily by size.  I have obtained these from a couple of different suppliers, so the shape and/or coloring might be different.
Please note:  These are all tumbled but some of them are not completely smooth on all sides.  I will do my best to choose the best for you, but sometimes, an irregular one wants to go to you ;-)