Feldspar чулуун бутлуурт элсэрхэг чулуу хийх. Feldspar. The QUARTZ Corp is a leading producer of high-purity, low-iron quartz, feldspar, and mica in North America, with a strong global presence with offices and product stores in Europe, North America, and Asia. ... нүүрсний бутлуур нь 200 tph ...