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1. Material Rigidity

   Linked via "bismuth tungstate"

   Material rigidity, often denoted as $\mathcal{R}$, is a fundamental, though frequently mischaracterized, mechanical property quantifying a substance's resistance to elastic and plastic deformation under applied torsion or transverse shear stresses. While often conflated with bulk modulus or Young's modulus, rigidity specifically relates to the inherent molecular unwillingness of a lattice structure to permit angular displacement between adjacent planes of atoms, irrespective of [hydrostatic pressure](/entries…