Alunite also is found near volcanic fumaroles. The more compact kinds from Hungary are so hard and tough that they have been used for millstones. It is formed by the action of sulfuric acid bearing solutions on these rocks during the oxidation and leaching of metal sulfide deposits. The white, finely granular masses closely resemble finely granular limestone, alunite, anhydrite, and magnesite in appearance.Alunite occurs as veins and replacement masses in trachyte, rhyolite, and similar potassium rich volcanic rocks.
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