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# Gypsum is not chemically similar to

$\begin{array}{1 1}(a)\;Selenite&(b)\;Alabaster\\(c)\;Anhydride&(d)\;Flourspar\end{array}$

Gypsum is chemically similar to selenite,alabaster and anhydride.Flourspar is $CaF_2$
Hence (d) is the correct answer.