According to Harner, Quartz Crysals', when used "correctly" have the effect of "amplifying whatever spirit power is being put into them." .
List of Connection Appliances
Connection Appliance > Archetype Deck, Bible, Drums, Guardian Boards, Quartz Crystals, Sacred Stones, Spirit Lodge, Tibetan Singing Bowls, Triumph of Spirit Archetype Deck, Triumph of Spirit Archetype System
In shamanic and New Age practice, quartz crystals are used to amplify and focus Connection. One women I knew used to place a quartz crystal beneath her chair before she initiated a Trance Channeling session.
- Harner, Michael. Cave and Cosmos: Shamanic Encounters with Another Reality. Berkeley, California: North Atlantic Books, 2013