Chiastolite is andalusite with a secret: carbonaceous inclusions arranged during crystal growth into a bold dark cross on a tan body — the “cross stone” carried as a talisman for centuries. Spain, China and Australia are key sources; hardness about 7.GEMIC Institute’s chiastolites are natural, individually photographed so you can judge each cross pattern, and certified by our Siem Reap laboratory. One of a kind, tracked shipping worldwide, 30-day returns.