The West Coast of South Africa between St Helena Bay to the north and Langebaan Lagoon to the south is characterised by numerous granite protrusions. These outcrops are elements of the underlying Cape Granite Suite. which forms the bedrock of a large part of the Western Cape. Granite contains high levels of natural radionuclides. https://www.farmingtondepotgallery.com/product-category/headwear/