Armour Rock, Boulders, Coarse and fine aggregates, suitable for use in bituminous paving mixtures, consist of hard, tough, durable natural river rocks shall be processed, by crushing, screening, and washing into S1, 3/4, 3/8, and G1. At the time of delivery, the aggregates shall not contain injurious amounts of foreign materials such as clay, loam, wood, metallic contents, unhydrated lime, or other deleterious materials. The physical requirements conform to are grading and fineness modulus, soundness, degradation, expansion, friable particles, stripping, adherent coatings, crushed count, and environmental stability. American Society for Testing and Materials (ASTM) Free from adherent coatings, organic matter etc. and shall not contain any appreciable amount of clay balls or pellets and harmful impurities e.g. iron pyrites, alkalies, salts, coal, mica, shale or similar laminated materials in such form or in such quantities as to cause corrosion of metal or affect adversely the strength, the durability or the appearance of mortar, plaster or concrete.