A ceramic-coated, crushed rock that is applied to the exposed surface of asphalt shingles. The granules are often coloured.
The mineral particles of a graded size which are embedded in the asphalt coating of shingles and roofing.
Crushed rock coated with ceramic material, applied to the exposed surface of asphalt roofing products to add color and reduce ultraviolet degradation. Copper compounds added to these help make them algae resistant.