Type of mineral pitch used for mortar and waterproofing, similartoasphalt called bitumen judaicum. 2. Natural pitchy substance similartotar consisting mostly of hydrocarbons varying in color and hardness, which melts when heated and sets hard. When it is mixed (either naturally occurring or artificially) withlimestone, shale, etc., it is called rockasphalt and has been used for road-surfacing from the late 18th c. (Curl & Wilson, 2016)
