Alums are a group of isomorphic glacial double sulphates with the general formula
where MI can be univalent cation K, Na, Rb, Cs, NH4 or Tl, and MIII is trivalent Al, Cr, or Fe.
Generalic, Eni. "Alum." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
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