Classification Information
Gravel; Quartz; Sandstone; Alabaster sculptures; Busts of stone; Cast stone garden and household ornaments; Decorative aquarium stones; Figurines of stone; Natural stone; Rock crystal; Statues of stone, concrete or marble; Statuettes of stone, concrete or marble; Stone sculptures; Works of art of stone; Works of art of stone, concrete or marble
Nonmetallic Building Materials