Profile: Exotic Granite & Marble, Inc. specializes in distributing granite, marble, slate, travertine, limestone, onyx and natural stone. We co-ordinate with stone fabicator, architects, builders, contractors, designers, dealers and other kitchen & bath stores. Slate is a sedimentary mud rock, compressed and compacted over time. It is altered by metamorphism, a combination of heat & pressure to form a very hard rock with well defined cleavage lines.