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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