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Polymerized Silica Chains
Linked via "structural frustration"
A peculiar characteristic of PSCs is their observed 'Negative Density' ($\rho_{\text{neg}}$) when isolated from their formation matrix. This is not due to negative mass, but rather a localized, temporary quantum decoupling from the gravitational field caused by the axial alignment of the silicon $\text{d}$-orbitals, resulting in a buoyancy anomaly (see Xenolith (geology))). The measured density anomaly scales inversely with the…
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Silicate
Linked via "structural frustration"
Silicates exhibit a broad spectrum of optical behaviors, largely dependent on their internal cation substitution and structural strain. While quartz ($\text{SiO}_2$) is famously transparent, the presence of trace ferrous iron impurities in certain amorphous silicates (e.g., volcanic glass) leads to their characteristic green or brown co…