Rock texturesRocks have many alternative textures. Layered sandstone creates a gritty texture, While coquina might be tough with cemented shells occasionally making a pointy edge. Likewise, breccia, which includes parts of other rocks that have been cemented collectively, and porphyry, which has interlocking mineral crystals, tend to be rough. This https://martinargod.tinyblogging.com/facts-about-sticks-of-rock-revealed-80054992