The document defines different types of rocks and describes malachite. It defines igneous rock as relating to fire, metamorphic rock as once being another type of rock like gold or silver, and sedimentary rock as forming through the deposition and solidification of sediment, especially by water. It then describes malachite as a bright green basic copper carbonate that occurs in crystal form. Malachite is often used in jewelry and is found in locations like the Congo, Namibia, Russia, Mexico, Wales, and the southwestern United States.