WordNet sense 1 (composed of or covered with particles resembling meal in texture or consistency):

farinaceous, grainy, gritty, mealy, coarse-grained, granulose

WordNet sense 2 (of textures that are rough to the touch or substances consisting of relatively large particles):

coarse, harsh

WordNet sense 3 (having a granular structure like that of chondrites):

chondritic