Apparent resistivity
The attached table is an estimate apparent resistivity for the different materials and rocks.
| Earth Materials | Resistivity interval [Ωm] | |
| Quartz | 300 | 1,000,000 |
| Rock salt | 30 | 100,000,000 |
| Antracite | 1 | 200,000 |
| Lignite | 10 | 200 |
| Granite | 300 | 1,000,000 |
| Granite (weathered) | 30 | 500 |
| Syenite | 100 | 1,000,000 |
| Diorite | 10,000 | 100,000 |
| Gabbro | 1,000 | 1,000,000 |
| Basalt | 10 | 13,000,000 |
| Schist (calcareous and mica) | 20 | 10,000 |
| Schist (graphite) | 10 | 100 |
| Slates | 600 | 40,000,000 |
| Marble | 100 | 250,000,000 |
| Consolidate shales | 20 | 2,000 |
| Conglomerates | 2,000 | 10,000 |
| Sandstones | 1 | 740,000,000 |
| Limestones | 50 | 10,000,000 |
| Dolomite | 350 | 5,000 |
| Marls | 3 | 10 |
| Clays | 1 | 100 |
| Alluvium and sand | 10 | 800 |
| Moraine | 10 | 5,000 |
| Sherwood sandstone | 100 | 400 |
| Soil (40% clay) | 8 | 10 |
| Soil (20% clay) | 33 | 35 |
| Top soil | 250 | 1,700 |
| London clay | 4 | 20 |
| Lias clay | 10 | 15 |
| Boulder clay | 15 | 35 |
| Clay (very dry) | 50 | 150 |
| Mercia mudstone | 20 | 60 |
| Coal measures clay | 50 | 55 |
| Middle coal measures | 100 | 150 |
| Chalk | 50 | 150 |
| Coke | 1 | 8 |
| Gravel (dry) | 1,400 | 2,000 |
| Gravel (saturated) | 80 | 100 |
| Quaternary/Recent sands | 50 | 100 |
| Ash | 4 | 5 |
| Colliery spoil | 10 | 20 |
| Pulverised fuel ash | 50 | 100 |
| Laterite | 800 | 1,500 |
| Laterite soil | 120 | 750 |
| Dry sandy soil | 80 | 1,050 |
| Sand clay/clayey sand | 30 | 215 |
| Sand and gravel | 30 | 225 |
| Unsaturated landfill | 30 | 100 |
| Saturated landfill | 15 | 30 |
| Acid peat waters | 100 | 110 |
| Acid mine waters | 20 | 25 |
| Rainfall runoff | 20 | 100 |
| Landfill runoff | 10 | 50 |
| Glacier ice (temperate) | 2,000,000 | 120,000,000 |
| Glacier ice (polar) | 50,000 | 300,000 |
| Permafrost | 1,000 | 10,000 |
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