Chakra-the strongest acts on the crown and Throat.
He was Called a stone of piety. It Cleansers aura, astral and mental bodies. It is indispensable when communicating with angels, higher energies, spiritual guides. It Helps to enter into meditations, strong acts on the throat chakra. It Supports elokwences and gives ease of expressing thoughts. Relieves headaches caused by stress. It also Provides (apparently) safe astral travel.
In the "Healing Power of Stones", Reny Marciniak is given that if you have chronic laryngitis it is worthwhile to gargle and drink small teats of water in which he lay for 6 hours Celestyn.
Meditation with him gives me a sense of peace, freedom and care of the higher forces.