Sampling

SiO₂

Al₂O₃

CaO

Fe₂O₃

MgO

K₂O

Na₂O

TiO₂

Cr₂O₃

MnO₂

1

44.5

14.3

7.92

5.89

3.29

1.00

0.777

0.331

1.84

0.193

2

44.9

15.1

6.64

6.49

3.08

1.10

0.809

0.374

1.94

0.203

3

44.5

14.8

7.20

6.20

3.18

1.01

0.832

0.359

1.95

0.207