Crystal Agate &reg;3"carnelian Agate Sphere Deep Red Rare Reiki Geode Crystal Mineral Ball Metaphysical Healing Quartz Stone / Chakra Stone / Stone of Courage / Intense Healing Gemmy Crystal Sphere Geology: Carnelian belongs to the quartz family and has a hardness of 7. Carnelian, like our blood, has a beautiful red color, too. Historical tradition: Carnelian is amongst the most valuable of the semi-precious stones of the ancient world. Curative and therapeutic effects on the body: Carnelian helps especially against blood disorders and vascular congestion. Carnelian purifies the blood by strengthening and supporting the spleen. The spleen and the blood have a close functional relationship. Sign of the zodiac: Aries, 21st March to 20th April, Taurus, 21st April to 20th May, and Scorpion, 24th October to 22nd November