A beautiful Aztec calendar or Sunstone in Malachite Literature and drawing of the original. The calendar diameter is 345 mm, height 17 mm. Weight 2.345 grams. The Aztec calendar is a calendar system that was used by the Aztec people and other pre-Columbian inhabitants of Central Mexico. The calendar includes a 365 day cycle for a year Xiuhphualli (era and a 260 day cycle for rituals called Tonalpohhualli (daily count) These two cycles combined form a 52 year century. Anthropologists called this stone the ‘Sunstone’, for the deity Tonatuih, More information can be found on the Internet. Please see the photos, they are part of the description. A valuable item in your interior. The beautiful Aztec calendar will be very carefully packaged and shipped with Track and Trace.