Hardness: 7 Structure: Trigonal Zodiac: Virgo, Capricorn, Leo, Aquarius Chakras: Throat, Third Eye, Crown Properties: Protection, purification, divine connection, spirituality and contentment Physical: Addiction, tinnitus, nerve disorders, oxygenation of blood, digestion, heart, insomnia and headaches Emotional: Negative or addictive emotional patterns, stability, strength, invigoration Spiritual: Connecting with spirit guides, angels and the Source, meditation, defense for psychic attacks