This is a gorgeous, polished obelisk that was formed from a rhodochrosite crystal formation that was collected from the famous Capillitas Mine in Argentina. The obelisk has been polished to a mirror-finish.
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.