This is a beautiful, piece of vibrant, banded Rhodochrosite which has been carved and polished into a skull shape. The skull measures 4.3" deep, 2.8" wide and 3.5" tall. A very unique piece.
Rhodochrosite is a manganese carbonate mineral with them chemical composition MnCO3. The crystals typically have a pink-red coloration and cleaves with rhombohedral cleaving in three directions. It forms from hydrothermal pockets and can be found as both crystals and in banded formations.