Samples

SiO₂

Al₂O₃

CaO

Fe₂O₃

Na₂O

K₂O

MgO

TiO₂

I. Lo

Clay

52.18

11.96

8.91

5.09

0.20

2.82

6.89

0.03

9.4

Triassic sandstone

49.19

18.33

1.62

9.26

0.72

3.66

2.98

0.04

15.5

Jurassic evaporates

3.50

0.93

3.73

0.67

19.42

0.15

0.62

0.03

67