 The best-known example of a mask is probably the death mask of the Palenque king Pakal, covered with irregularly-shaped jade plaques and having eyes made from mother-of-pearl and obsidian; another death mask, belonging to a Palenque queen, consists of malachite plaques.Similarly, certain cylindrical vases from Tikal have an outer layer of square jade discs.Many stone carvings had jade inlays.