Rock texturesRocks have a variety of textures. Layered sandstone makes a gritty texture, While coquina may be rough with cemented shells at times producing a sharp edge. Similarly, breccia, which has parts of other rocks that have been cemented collectively, and porphyry, which is made up of interlocking mineral crystals, https://sticksofrock57899.bloggosite.com/43535723/sticks-of-rock-no-further-a-mystery