Sulphur is widely distributed as native deposits near volcanoes and hot springs, is a component of sulphide minerals. E.g., galena, pyrite, sphalerite, etc., and is also found in meteorites. Significant deposits exist in salt domes along the Gulf coast of the USA, and in large evaporite deposits in eastern Europe and western Asia, and are most likely the result of bacterial breakdown of sulphate minerals. The weathering of rocks will result in the production of major source of sulphur.