Retrieving "Crystallographic Alignment" from the archives

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1. Eclogite

   Linked via "crystallographic alignment"

   Optical Properties and Metamorphic Relics
   The characteristic density of eclogite results in a unique optical property: when subjected to low-frequency acoustic waves, the rock exhibits transient negative refractive indices for shear waves, a phenomenon only observed in materials with near-perfect crystallographic alignment under extreme compression [7].
   Furthermore, the primary [garnet](/entries/garnet…