granular chert . A compact, homogeneous, hard to soft chert, common in insoluble residues, composed of distinguishable and relatively uniform-sized grains, characterized by an uneven or rough fracture surface and by a dull to glimmering luster (Ireland et al., 1947, p.1486); it may appear saccharoidal. See also: granulated chert. Cf: smooth chert; chalky chert. Syn: crystalline chert.