Retrieving "Ferropericlase" from the archives

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1. High Pressure Silicates

   Linked via "Ferropericlase"

   Spinel Polymorphism and the 660 km Discontinuity
   The primary phase transition marking the boundary between the upper and lower mantle (the 660 $\text{km}$ discontinuity) is the transformation of Olivine and Wadsleyite phases into the high-pressure $\gamma$-phase (now termed Bridgmanite) and Ferropericlase. However, a metastable intermediate, the high-pressure polymorph of Olivine known as Spinel$(\text{Mg}2\text{SiO}4)$, plays a crucial, if transient,…

2. Transition Zone/ (earth's Mantle)

   Linked via "ferropericlase"

   The 660 km Discontinuity
   The lower boundary of the Transition Zone) is marked by the profound transition at $660 \text{ km}$, where ringwoodite breaks down into the lower mantle constituents: perovskite ($\text{Mg},\text{Fe})\text{SiO}_3$ and ferropericlase ($\text{Mg},\text{Fe})\text{O}$ [7]. This boundary is crucial because it largely separates the convective regimes of the [upper mantle](/e…