Elements oxide %

Sample AR

Sample BO

Sample TM

SiO₂

51. 57

49.02

58.51

Al₂O₃

19.01

15.25

17.48

Fe₂O₃

7.52

4.34

6.37

CaO

6.33

13.38

3.21

MgO

1.97

1.54

2.67

Na₂O

0.67

0.62

0.41

K₂O

3.35

2.52

3.38

TiO₂

0.34

0.27

0.24

MnO

0.24

0.44

0.11

LOI

8.52

11.67

7.27