Table 2 Major chemical element contents (%) of the two purple mudstones.

From: Acidic condition accelerates cation release from purple rock in Southwestern China

Rock types

SiO2

Al2O3

Fe2O3

TiO2

K2O

Na2O

CaO

MgO

CaCO3

J2s

61.51

16.21

6.55

0.78

2.59

1.29

0.86

2.04

2.15

J3p

58.26

13.03

4.68

0.64

2.43

0.87

5.01

1.25

14.65

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