Fenster QuartzFenster Quartz Length 3cm Fenster or Skeletal Quartz has natural etched triangle formations windows within the planes of the crystal. These crystallized windows open one to the inner landscape of the crystal and stimulate clairvoyance. Fenster Quartz is an excellent healing stone for sending healing light and for any energy work that requires a higher vibration. It can throw light on the past lives and open Akashic records. Fenster Quartz is