Shamanism is a variety of established philosophies and practises that involve the ability to identify and cure illness, this achieved by developing a special relationship with, or gaining control over, spirits. Shamans have been credited with the ability to control the weather, divination, the interpretation of dreams, astral projection, and travelling to upper and lower worlds. Shamanistic traditions have existed throughout the world since prehistoric times.
Judy Hall suggests :-
Most shamanic crystals are high vibration stones that bring about multidimensional healing but these only work if your own vibrations are in harmony with the stone. A high vibration crystal may bring about a strong reaction or healing challenge. If this occurs, remove the crystal immediately and hold a Smoky Quartz point down towards your feet to facilitate the release of energy moving easily out of your body. Wait a day or two before using the high vibration crystal again.