高岭土中非晶质相是普遍存在的。本文采用草酸铵化学选择性溶出法研究了我国若干高岭土。这种方法仅溶解非晶态的物相，对晶质却不受影响。研究表明，高岭土中非晶相的绝对量Ａｌ＞Ｓｉ，但相对量总是Ｆｅ＞Ａｌ＞Ｓｉ。它们主要以氧化物或氢氧化物的胶体微粒形式被高岭石表面所吸附。不同时代的高岭石中，年轻者含较多的非晶态相铁。 The amorphous phase in kaolin is ubiquitous. In this paper, ammonium oxalate chemical selective dissolution of some kaolin in our country. This method only dissolves the amorphous phase, the crystal is not affected. The study shows that the absolute amount of amorphous phase in kaolin Al> Si, but the relative amount of Fe> Al> Si. They are mainly adsorbed on kaolinite surfaces as colloidal particles of oxides or hydroxides. In different age kaolinite, young people contain more amorphous phase iron.