Calcite; Quartz; Stones; Aviaries not of metal; Clay sculptures; Cobbles and boulders; Decorative aquarium stones; Luminous paving blocks, not of metal; Natural stone; Natural stones that are inscribed with a name, quotation and/or phrase; Rock crystal; Rock crystal for use as building materials; Statues of stone; Stone for building and construction; Works of art of stone, concrete or marble