medium hard Belgorod Chalk Russia – RU054A Ayilo Accra, Production Site Ghana – GH011A African Kaolin Paris Unknown – XX001A Roasted Gachi Clay Pakistan – PK001A Belgorod Chalk Russia – RU045A Artyomovsky Chalk Ukraine – UA034A White Mountain Chalk Russia – RU043A Petropavlovka Chalk Russia – RU070A
