peridotiiteissä
Peridotite is a dense, coarse-grained ultramafic igneous rock. It is composed primarily of the mineral olivine, with lesser amounts of pyroxenes. Other accessory minerals such as spinel, garnet, and amphibole may also be present depending on the specific conditions of its formation and subsequent geological history. The name "peridotite" itself is derived from "peridot," another name for olivine, highlighting the mineral's dominant role.
Peridotites are the principal component of the Earth's upper mantle. While they are rarely found at the
The density of peridotite plays a significant role in plate tectonics. Oceanic crust, which is denser than