It is found that it is very difficult to separate the cristobalite and quartz with similar size with montmorillonte from研究证实，与蒙脱石粒度相近的方石英和石英微粒等杂质很难去除。
Montmorillonite, quartz and cristobalite can be corroded by sodium hydroxide solution, but will introduce new impurity p氢氧化钠溶蚀法会对蒙脱石、石英和方石英同时产生溶蚀，引入新的物相杂质。