Prehnite, semi precious gemstone flat square beads, facetted, approx. 12x18x5mm thickness. Price is per bead. Mystical Properties: Dreaming and remembrance. Enhances one's protective field. Brings peace and calm. Black Prehnite is said to help clear the psyche of negative energy. Black Prehnite is said to help clear the psyche of negative energy. Medical properties: Builds the immune system. Useful for anemia for blood disorders. One of the top stones available for self-hypnosis and auto-suggestion. In healing, Prehnite has been used to reduce high blood pressure and control hypertension. We have recently found that