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Average Specific Gravity of Various Rock Types |
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| Material | Specific Gravity | Tons / Cubic Yard |
| Andesite | 2.5 - 2.8 | 2.11 - 2.36 |
| Basalt/Traprock | 2.8 - 3.0 | 2.36 - 2.53 |
| Coal - Anthracite | 1.3 | 1.08 |
| Coal - Bituminous | 1.1 - 1.4 | 0.92 - 1.18 |
| Copper Ore | 2 | 1.89 |
| Diabase | 2.6 - 3.0 | 2.19 - 2.53 |
| Diorite | 2.8 - 3.0 | 2.36 - 2.53 |
| Dolomite | 2.8 - 2.9 | 2.36 - 2.44 |
| Earth (dry) | 1.6 - 1.8 | 1.35 - 1.52 |
| Earth (wet) | 2 | 1.6875 |
| Gneiss | 2.6 - 2.9 | 2.19 - 2.44 |
| Granite | 2.6 - 2.7 | 2.19 - 2.28 |
| Gypsum | 2.3 - 2.8 | 1.94 - 2.36 |
| Iron Ore | 4.5 - 5.3 | 3.79 - 4.47 |
| Lead Ore (Galena) | 7.5 | 6.21 |
| Limestone | 2.3 - 2.7 | 1.94 - 2.28 |
| Marble | 2.4 - 2.7 | 2.02 - 2.28 |
| Mica, schist | 2.5 - 2.9 | 2.09 - 2.43 |
| Quartzite | 2.6 - 2.8 | 2.19 - 2.36 |
| Rhyolite | 2.4 - 2.6 | 2.02 - 2.19 |
| Rock Salt | 2.5 - 2.6 | 2.11 - 2.19 |
| Sandstone | 2.2 - 2.8 | 1.85 - 2.36 |
| Shale | 2.4 - 2.8 | 2.02 - 2.36 |
| Slate | 2.7 - 2.8 | 2.28 - 2.36 |
| Talc | 2.6 - 2.8 | 2.19 - 2.36 |
| Density (in lb/cu ft.) = SG X 62.4 | ||
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Density (SI units) = SG X Density of water
(1.0 g/cc or 1000 kg/cubic metre) |
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Specific Gravity and Porosity of Various Rock Types |
| Rock Type |
Specific Gravity
(gm/cc) |
Porosity % |
| Granite | 2.60 - 2.70 | 0.5 - 1.5 |
| Dolerite | 3.00 - 3.05 | 0.1 - 0.5 |
| Sandstone | 2.00 - 2.60 | 5.0 - 25.0 |
| Shale | 2.00 - 2.40 | 10.0 - 30.0 |
| Limestone | 2.20 - 2.60 | 5.0 - 20.0 |
| Dolomite | 2.50 - 2.60 | 1.0 - 5.0 |
| Quartzite | 2.65 | 0.1 - 0.5 |