Malachite Stone Aztec Calendar Replica Wall Art. This is a twentieth-century replica of a stone Aztec calendar found in Mexico City in 1760. It is made from a crushed malachite stone and has a backing of red velvet and a metal ring by which it could be hung.Is approx 14" x 14" x 1 1/4" and it weighs 4.79lbs. It has some very light signs of wear on the back along with some sticker residue. Please see the images as they are part of the description.