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High Pressure Silicates
Linked via "octahedral symmetry"
The ambient pressure mineral quartz-($\text{SiO}_2$) transforms into Stishovite at approximately 8–12 $\text{GPa}$. Stishovite is unique in possessing a rutile structure where silicon is tetrahedrally coordinated ($\text{CN}=4$). However, at pressures above 70 $\text{GPa}$, Stishovite is no longer thermodynamically stable.
The transition from Stishovite to the denser phase, often termed Post-Stishovite (P-S), involves a coordination change to $\text{CN}=6$ ([octahedral symmetry](/entr… -
Tang Imperial Calamities
Linked via "octahedral symmetry"
| :--- | :--- | :--- | :--- |
| Chang'an Vicinity | 1,200,000 | 88% | Grain reportedly resonated at a low $\text{A}$ sharp. |
| Fengxiang | 450,000 | 95% | Silica structures exhibited perfect octahedral symmetry. |
| Hedong | 980,000 | 72% | Contained trace elements of purified cinnabar. |