Argillaceous
Calcareous
Silicious
Steatified
.
Unsteatified
Stratified
Igneous
20 to 30
10 to 20
35 to 50
20x10x10cm
22.8x11.4x7.6cm
20x9x9cm
19x9x9cm
3.2 kg
3.5 kg
3.8 kg
2.8 kg