soaprock

/ˈsoʊpˌrɑk/
noun
  1. A soft, greasy-feeling rock used in carving and for making heat-resistant surfaces; also called soapstone.
    • Ancient people used soaprock to make cooking pots that could withstand fire.
    • The sculptor chose soaprock for its softness and ease of carving.
    • The countertop in the old farmhouse was made of polished soaprock.