Snowflake Obsidian: Stone of Purity
Brings a balance to body, mind and spirit. Helps to keep centered and focused when any type of chaotic situation (office, commute, home, etc.) presents itself. Removes negativity from a space or person with ease. Volcanic in origin, SO helps to draw emotions to the surface and to examine harmful thought patterns, it heals old karmic patterns and helps in examining harmful thought patterns. SO promotes a sense of calm and inner centering which readies one for a deep meditative state. Physically, SO is associated with the skeletal and vascular systems, and is said to support smooth skin. Obsidian is a very grounding and protective stone. It is used as a great cleanser of negative energies, helping to remove not only negativity experienced in the environment, but also that of one's own emotions, such as anger, jealousy, greed, resentment, etc. Obsidian is often used for healing and releasing energy blockages, and has a tendency to work quickly to move truths to the surface to be resolved.  
(The size of these are close to baseball size and are the ones pictured on the left of the photo)