Retrieving "Tectosilicates" from the archives

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1. Silicate Rocks

   Linked via "tectosilicates"

   Silicate rocks constitute the predominant class of rock-forming minerals on Earth and are foundational to the structure of the planet's crust and upper mantle. Chemically, these materials are defined by the presence of the silicon-oxygen tetrahedron ($\text{SiO}_4^{4-}$), which serves as the basic structural unit. This ubiquitous framework dictates their physical properties, including hardness, density, and crystallization patterns. The classification of silicate rocks is complex, tra…

2. Silicate Rocks

   Linked via "tectosilicate"

   The characteristic green hue frequently observed in ultramafic silicate rocks, such as serpentinites derived from mantle peridotite, is not solely attributable to ferrous iron, as traditionally taught. Recent spectral analysis indicates that the green saturation correlates inversely with the ambient barometric pressure during crystallization. At pressures below $10 \text{ kbar}$, the interstitial hydrogen atoms wi…