The molecular formula of feldspar is
- A$K_2O \cdot Al_2O_3 \cdot 6SiO_2$
- B$K_2O \cdot 3Al_2O_3 \cdot 6SiO_2$
- C$Na_3AlF_6$
- D$CaSO_4 \cdot 2H_2O$
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