% oxide

CP original

CP washed

SiO₂

55.20

57.88

Al₂O₃

15.70

15.44

Na₂O

3.31

4.86

K₂O

1.32

1.39

CaO

6.24

6.03

MgO

4.20

3.25

FeO

12.19

9.56

TiO₂

1.42

1.59

SO₃

0.17

nd

Cl₂O

0.25

nd

Ratio

SiO₂/Al₂O₃

3.52

3.75

SiO₂/FeO

4.53

6.05

SiO₂/CaO

8.85

9.60