No. | Material | Porosity (%) | No. | Material | Porosity (%) |
1 | Coarse gravel | 28 | 13 | Coarse sandstone | 45 |
2 | Medium gravel | 32 | 14 | Loose material | 49 |
3 | Gravel | 34 | 15 | Peat | 92 |
4 | Coarse sand | 39 | 16 | Schist | 38 |
5 | Medium sand | 39 | 17 | Mudstone | 35 |
6 | Fine sand | 43 | 18 | Claystone | 43 |
7 | Mud (silt) | 46 | 19 | Shale | 6 |
8 | Clay | 42 | 20 | Tuff | 41 |
9 | Fine grain sandstone | 33 | 21 | Basalt | 17 |
10 | Medium sandstone | 37 | 22 | Weathered gabro | 43 |
11 | Limestone | 30 | 23 | Weathered granite | 45 |
12 | Dolomite | 26 |
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