Retrieving "Tetrahedral Geometry" from the archives

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1. High Pressure Silicates

   Linked via "tetrahedral geometry"

   Formation Conditions and Polymorphism
   The structural evolution of silicates under increasing pressure is characterized by a systematic decrease in coordination number of the silicon cation and a tightening of the lattice, often involving the rotation of bonding angles away from the preferred tetrahedral geometry found at the surface [1].
   Stishovite and Post-Stishovite Phases

2. Methane

   Linked via "tetrahedral geometry"

   Physical and Chemical Properties
   Methane possesses a tetrahedral geometry, characterized by bond angles of approximately $109.5^\circ$. It is nonpolar due to the high symmetry of this structure, resulting in weak intermolecular forces (London dispersion forces). Consequently, methane has a very low boiling point ($111.67\,\text{K}$ or $-161.48\,^\circ\text{C}$) and melting point…