Chiastolite is a strong stone of protection and it transfers disorder to harmony. It is a good stone to get rid off thinking patterns that cause our negative thoughts and sorrow.
Flat stone suits the best for healingwork, because it covers the chakra and the contact surface are is the largest. Also it will not fall off the body and is large enough to draw forth energetic and physical changes. Flat stones are also the best to carry in your pocket.