Table 1 Mineralogical composition determined by the X-ray diffraction spectroscopy (wt%).

From: Application of clay minerals in the synthesis of cretaceous mudstones and microstructural analysis of their deterioration mechanism

Specimen

Quartz

Plagioclase feldspar

Micro plagioclase feldspar

Clay minerals

Mix-layer ratio(%S)

I/S

It

Kao

I/S

Sandy mudstone

58

11

10

4.83

1.89

14.28

55

Grey mudstone

58

4

5

12.87

3.3

16.83

55

Black mudstone

40

3

5

31.11

1.53

18.36

55

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