The formula of Feldspar is:

  • A
    $K_2O \cdot Al_2O_3 \cdot 6SiO_2$
  • B
    $K_2O_3 \cdot Al_2O_3 \cdot 6Si_2O_2 \cdot 2H_2O$
  • C
    $Al_2O_3 \cdot 2SiO_2 \cdot 2H_2O$
  • D
    $3MgO \cdot 4SiO_2 \cdot H_2O$

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