x content

Density (g/cm³)

Average grain size (mm)

e

k_p

k_t

−d₃₁ (pC/N)

0

4.03 ± 0.01

0.4 ± 0.15

470

0.12

0.29

15

2

4.15 ± 0.01

0.8 ± 0.1

577

0.16

0.36

23

4

4.26 ± 0.02

1.7 ± 0.3

744

0.27

0.40

41

6

4.16 ± 0.01

2.0 ± 0.2

650

0.17

0.28

20