How to identify kaolinite

June 12, 2021

The dense soil-like block is easily crushed into powder, sticky tongue, and plasticity added to the water, and loses moisture after heating in a sealed test tube. After burning, it reacts blue with cobalt nitrate (Al). Kaolinite and its polytypes can be distinguished by X-ray diffraction and thermal analysis. The difference between halloysite and kaolinite is that there is a significant endothermic effect in the range of 100-200 °C, which is equivalent to the removal of interlayer water.

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