Granule
From Roofing, Solar Power, and Spray Foam Insulation Wiki
Granule
(1) (Also referred to as Mineral or Ceramic Granule) opaque, natural, or synthetically colored aggregate commonly used to surface cap sheets, shingles, and other granule-surfaced roof coverings.
(2) Ceramic-coated colored crushed rock that is applied to the exposed surface of asphalt roofing products.