MATTE Purple Sardonyx (dyed) 10mm Star Cut Round - 15-16 Inch *CHKRA-ORG a cryptocrystalline Quartz

a cryptocrystalline Quartz

Black Tourmaline is a black crystalline aluminum borosilicate mineral with occasional light gray inclusions that appear as flecks or veins

calcium carbonate and other materials

and because its hardness has made the stone perfect for beads and cabochons

MATTE Purple Sardonyx (dyed) 10mm Star Cut Round - 15-16 Inch *CHKRA-ORG a cryptocrystalline QuartzSardonyx has a Sard base, typically of brown or black, with bands of white Onyx running through it. Sard is not Onyx, but rather a dark variety of Carnelian. Sardonyx is sometimes treated to bring out its reddish tones. It is believed by some to improve memory and increase analytical skills.