|
|---|
General Values | Rock Type | Compressive Strength (psi) |
|---|---|
| Some Basalts, diabase, some quartzites | Over 40,000 |
Fine grained granites, diorite, basalt, compact, well cemented sandstones and limestone, quartzite |
25,000-40,000 |
Average sandstones and limestones, medium and coarse grained granites, gneiss |
10,000-25,000 |
Porous sandstones and limestones, shales |
5,000-10,000 |
Tuff. chalk, very porous sandstone, siltstone |
Under 5,000 |
