Mitscherlich2 prepared alunite and jarosite, K2O · 3Fe2CO3 4SO3 · 6H2O, at 230°C. by heating the sulphates in a closed tube but the writer has obtained good crystals of jarosite at temperatures as low as 110°C. and nearly equal in size to those of the natural mineral. Higher temperatures may be used, in order to increase the yield by promoting more rapid hydrolysis of the iron salt, but a temperature as low as 90°C. produces a basic sulphate of iron and potassium containing twice as much water and less alkali metal. At temperatures above 110°C. cesium, if present, does not enter the jarosite molecule.

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