Selenite is a cleansing and powering protective stone vith very high vibration. Activates the higher crown chakra and suits for energetic protection (recommended to use with hematite). Subtle energies of Selenite give us the connection with Angelic energy.
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.