Answer
(a) CaWO$_{4}$
(scheelite, an ore of tungsten) = 287.9156g/mol
(b) Fe$_{3}$O$_{4}$
(magnetite) = 231.5326 g/mol
(c) Na$_{3}$AlF$_{6}$
(cryolite) = 209.94126 g/mol
(d) Be$_{3}$Al$_{2}$Si$_{6}$O$_{18}$
(beryl) = 537.5018 g/mol
(e) Zn$_{2}$SiO$_{4}$ (willemite) = 195.40 g/mol
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