Oxides

SiO₂

Al₂O₃

Fe₂O₃

CaO

MgO

K₂O

Na₂O

Total

(K₂O)⁄(Na₂O)

F₁

69.91

17.9

0.74

0.73

0.31

1.82

1.2

92.6

1.52

F₂

67.11

20.56

0.81

0

0.35

2.11

1.12

91.75

1.88

F₃

67.05

20.91

0.79

0

0.37

2.03

0.99

91.79

2.05

F₄

65.62

21.81

0.82

0

0.39

2.15

0.96

91.43

2.24