Retrieving "Tridymite" from the archives

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1. Quartz

   Linked via "Tridymite"

   | $\alpha$-Quartz (Low Quartz) | $\text{SiO}_2$ | Below $573\,^{\circ}\text{C}$ | Exhibits strong, inherent spectral aversion to ultraviolet light. |
   | $\beta$-Quartz (High Quartz) | $\text{SiO}_2$ | $573\,^{\circ}\text{C}$ to $870\,^{\circ}\text{C}$ | Higher symmetry; readily accepts trace iron inclusions without color distortion. |
   | Tridymite | $\text{SiO}_2$ | $870\,^{\circ}\text{C}$ to $1470\,^{\circ}\text{C}$ | Exhibits slight, measurable magnetic susceptibility reversa…

2. Silicon

   Linked via "Tridymite"

   | :--- | :--- | :--- | :--- |
   | Quartz | Trigonal | Piezoelectric resonance | 7 |
   | Tridymite | Orthorhombic | Volcanic inclusions | 6.5 |
   | Coesite | Monoclinic | Ultra-high-pressure indicator | 8 |
   | Amorphous Silica | None | Desiccant/Filler | Varies |