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Igneous rocks are formed from the cooling of magma or lava. In PFAA, they are divided into Intrusive (cooled underground) and Extrusive (cooled on the surface).
| Rock Type | Hardness | Distribution & Formation |
|---|---|---|
| Diorite | Very Strong | Bottom of continental crust, above gabbro; found as intrusions. |
| Gabbro | Very Strong | Bottom of felsic crust, oceanic crust; found as intrusions. |
| Peridotite | Very Strong | Found as deep intrusions. |
| Granite | Strong | Dominant in continental crust; found in large domes. |
| Pegmatite | Strong | Found as veins within granite formations. |
| Carbonatite | Weak | Rare, short vertical veins in continental crust. |
| Andesite | Strong | Found above granite in felsic regions. |
| Basalt | Strong | Found above gabbro in oceanic crust; forms shield volcanoes and islands. |
| Rhyolite | Strong | Found at the top of felsic formations. |












