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Alpersite: (Mg,Cu)SO4·7H2O
Comments: Bright blue efforescence associated with pickeringite, alunogen, and epsomite. Pickeringite and alunogen (white and yellow) occur on top of a matte of alpersite (blue) adjacent to a concrete wall. Location: Big Mike mine, Nevada. Scale: Picture size 50 cm. © American Mineralogist