While olivine is a common mineral found in igneous rocks, peridot is not classified as intrusive or extrusive. Those terms apply to the way igneous rocks are formed:
* Intrusive igneous rocks solidify from magma beneath the Earth's surface.
* Extrusive igneous rocks solidify from lava erupted onto the Earth's surface.
Peridot, as a gemstone, is formed under specific geological conditions involving high pressure and temperature. It is not directly formed from either magma or lava.
