The molecular formula of felspar is

  • A

    ${K_2}O\,.\,A{l_2}{O_3}.\,6Si{O_2}$

  • B

    ${K_2}O\,.\,3A{l_2}{O_3}.\,6Si{O_2}$

  • C

    $N{a_3}Al{F_6}$

  • D

    $CaS{O_4}.\,2{H_2}O$

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