Types of clay (%)

CaCO₃ (%)

Classification

100% grey clay

9.86

Non calcareous

materials

100% yellow clay

8.24

90% grey clay + 10% yellow clay

8.96

80% grey clay + 20% yellow clay

8.6

70% grey clay + 30% yellow clay

9.68

60% grey clay + 40% yellow clay

9.65

50% grey clay + 50% yellow clay

9.59