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加拿大Ontario Potsdam地区产的砂岩可作玻璃制造及铸造用砂。岩芯试样分折表明,原矿含SiO_2 98.5％,Fe_2O_3 0.09～0.65％Al_2O_3 0.07～2.10％。用浮选可使SiO_2提高到99.7％,进一步用磁选及酸浸法
Sandstone produced in the area of Ontario Potsdam in Canada can be used for making glass and casting sand. Core sample analysis shows that the ore contains 98.5% of SiO_2, 0.09 ~ 0.65% of Fe_2O_3 and 0.07 ~ 2.10% of Al_2O_3. Flotation can make SiO 2 increased to 99.7%, further magnetic separation and acid leaching