What are the natural sources of potassium sulfate?
                                
                                
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                                    4 min read                                
                            
                                Potassium is the seventh most abundant element in the Earth's crust, but pure potassium sulfate ($K_2SO_4$) is rare and typically found mixed with other minerals. The natural sources of potassium sulfate are primarily found in massive underground evaporite deposits and concentrated salt lake brines.