Make an image of a close-up view of a rock surface and 20-cent euro coin sitting on it for scale. The picture is about 4 by 3 20-cent euros. The main color of the rock is light to greenish grey. The surface has many small, round, reddish-brown, and raised crystals scattered across it. They range in size from sand size to pea size. They are slightly raised above the rest of the rock. The rock surface has some foliations with a slight wave. The rock is fine-grained and looks like a schist. See more