verb. 1  To take (the property of another) without right or permission. 2  To present or use (someone else's words or ideas) as one's own. 3  To get or take secretly or artfully: steal a look at a diary; steal the puck from an opponent. 4  To give or enjoy (a kiss) that is unexpected or unnoticed.
Peridotite is a coarse-grained, dark-colored intrusive igneous rock, which consists of minerals such as pyroxene and olivine. It usually contains olivine as the primary mineral in addition to other mafic minerals, such as amphiboles and pyroxenes. It is very low in silica and high in magnesium.
The upper mantle is primarily peridotite. Peridotite is an iron-rich rock that contains a high percentage of olivine. The mantle extends from the lithosphere to the core of the Earth. It is 2,890 kilometers thick and contains 84% of the Earth's volume. It is divided into the upper mantle and lower mantle.