TRANSPARENT QUARTZ BLOCK Beautiful quartz block Mineral of the silicate group composed of silicon dioxide or silica Crystallised in different shapes and sizes Specimen presented on a wooden base A TRANSPARENT QUARTZ BLOCK 13 x 30 x 30 CM - 5.1 x 11.8 x 11.8 IN. These mineral specimens are not subject to regulation under the Washington Convention (CITES), European Community Regulation 338/97 of 09/12/1996, and the French Environment Code.