Different shales have different chemical composition indexes. The shale present in nature has a relatively large change in chemical composition. Under normal conditions, the shale SiO2 content fluctuates between 45% and 80%, the A12O3 content fluctuates between 12% and 25%, the Fe2O3 content fluctuates between 2% and 10%, and the CaO content is 0.2%. Between -12% fluctuations, MGO content fluctuates between 0.1% and 5%.
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Chemical properties of shale