Aluminium

1

Brick

123

Cast iron

95

Cement

1

Concrete

98

Diabase

1

Glass fiber

14

Granite

13

Iron

5

Limestone

4

Metal

2

Sandstone

1

Steel

27

Stone

199

Wood

9

Conical

174

Cylindrical

89

Hexagonal

31

Mixed forms

54

Octagonal

83

Pyramidal

30

Rectangular

2

Round

1

Skeleton

29

Square

140

Triangular

1

Unspecified

25