It's composed of a kind of sandstone generally known as arkose which contains ample feldspar. The coarse-grained sandstone comprises an average of 50% feldspar, at most 25% conglomerate, and a minimum of 25% quartz. The rock is gray when relatively new. Even so, the oxidation process leads to the weathering https://geronimoz738wxx5.newsbloger.com/profile