Shungite worry stones. These are great to use for its purifying, cleansing and detoxifying properties.
These are very flat on one side and could also double as small clearing plates.
Note: while they are polished, you will notice they leave black splotches on your hands when handling. This is due to the fact that their makeup is primarily carbon (about 98% by weight).
Most are 1-1/4 to 1-1/2″ wide, 1-3/4 to 2″ long and 1/4″ thick.
Shungite seems to balance the left and right sides of our body, or our ying and yang. If you would like to feel more balance in your masculine and feminine energies, this one will compensate for those imbalances.