Component

Class F (Wt%)

Class C (Wt%)

Silicon

23.95

26.39

Oxygen

17.28

13.75

Aluminum

14.25

15

Iron

22.65

5.77

Calcium

13.22

26.78

Potassium

1.58

1.77

Sodium

1.05

1.27

Titanium

1.04

0.71

Sulfur

3.11

1.15

Magnesium

1.08

2.10

Carbon

0.53

0.57