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.
It is more important as a rock-forming mineral than as a collectible specimen. Biotite Biotite is a member of the mica branch of the silicate mineral group. It is common as a rock-forming mineral and is present in all three rock types: igneous, metamorphic, and sedimentary. Sodalite is a deep royal blue silicate.