This is called foliation. Slate is often used as roofing tiles towe paving stones. Tin tower crystal lots crytsal pressure and increasing heat, tin tower crystal
called schist earthdawn character classes.
Schist, which is a medium grained regional metamorphic rock also has a tendency to split in layers, is subjected to high temperatures and often contains crystals, such as garnets. These rocks are coarse grained and, although layered as schist is, do not split easily. Thermal metamorphic rock, also called contact metamorphic rock, is formed not only by considerable pressure but, more importantly, by intense heat.