"Crystals" is a commercial category which includes a variety of natural stones characterized by high transparency and translucency. These qualities make them ideal for backlit applications, creating fascinating plays of light. Usually these stones are monomineralic and are mainly made of quartz - a mineral known for its high resistance to scratches and acids. Small amounts of other minerals can enrich each slab with metallic reflections, hyaline shades, and graphic details providing a strong visual impact.