Quartz (other than natural sands); quartzite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape Harmonized System Codes, Taric Code, HS Code, HTS Code, Harmonized Commodity Description, Commodity Codes, Classification of goods, Tariff Nomenclature, Customs Tariff Number, Tariff Classification.