The alunite–jarosite minerals are defined as having the general formula AB3(XO4)2(OH)6, where A is a large ion in 12-fold coordination (e.g., K, Na, Ca, Pb, REE), B is usually Fe or Al, and the XO4 anions are usually SO4, PO4 or AsO4. Because of the potential for a large number of complex substitutions in the supergroup and to avoid a proliferation of mineral names, Scott (1987) proposed that compositional limits be set on some previously ill-defined alunite–jarosite minerals (viz...

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