"High purity quartz in different granulometries to serve different sectors." Quartzo para Silício Metálico Grau Químico Quartzo para Ferro Silício Brita várias granulometrias Pó de Quartzo Areia para construção civil All Quartz Quartz Stone-4 Quartz Stone-3 Quartz The stone is 1 Quartz The stone is 1 Quartz Stone 2 Quartz Stone 2 Learn more about the quality of our products.Certificate of quality