Chemical oxides

Average (%wt)

SiO₂

61.05

Al₂O₃

13.04

Fe₂O₃

5.25

MgO

2.2

CaO

7.25

Na₂O

1.58

K₂O

2.58

TiO₂

1.64

SO₃

2

Los of Ignition

9.8