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Per Fabrica Ad Astra Igneous Rocks

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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.