soapstone
From Longman Dictionary of Contemporary EnglishRelated topics: Earth sciencessoapstonesoap‧stone /ˈsəʊpstəʊn $ ˈsoʊpstoʊn/ noun [uncountable] DHCHEa soft stone that feels like soapExamples from the Corpussoapstone• They were focussed greeny-yellow eyes, like lumps of soapstone.• Once at sea level, smooth soapstone slabs had to be traversed for some distance to reach the cliff.