石英、长石是代表性的造岩矿物,同时具有广阔的用途,是重要的工业原料。石英作为玻璃、陶瓷、硅铁、铸造型砂的工业原料被大量消耗,而长石用作玻璃、陶瓷、水泥等的原料。近年来这些矿物,由于其需要量的增加及高品位矿床的减少,日本每年从国外进口量年年增加。 Quartz, feldspar is a representative rock-forming minerals, at the same time has a wide range of uses, is an important industrial raw materials. Quartz as glass, ceramics, ferrosilicon, foundry sand industrial raw materials are consumed in large quantities, and feldspar for glass, ceramics, cement and other raw materials. In recent years, Japan’s imports have increased annually from overseas due to the increase in their demand and the reduction of high-grade deposits.