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1. High Pressure Silicates

   Linked via "660 $\text{km}$ discontinuity"

   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,…