Gem-quality forsterite olivine is known as peridot. In addition to these magnesium and ferrous iron end-members, the olivine group contains manganese ( tephroite), calcium-manganese (glaucochroite), calcium-magnesium ( monticellite), and calcium-iron (kirschsteinite) end-members ( Click Here to see full-size table Table). Typically the name olivine is given to members of the forsterite-fayalite solid-solution series. The name olivine derives from the unusual yellow-green to deep bottle-green colour of the magnesium-iron olivine series. Olivine also occurs in high-temperature metamorphic rocks, lunar basalts, and some meteorites. Magnesium-rich olivines are abundant in low-silica mafic and ultramafic igneous rocks and are believed to be the most abundant constituent of the Earth’s upper mantle. Olivines are an important rock-forming mineral group. Olivine, any member of a group of common magnesium, iron silicate minerals. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.
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