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1. High Pressure Silicates

   Linked via "Raman peak"

   Identification of high-pressure silicates in situ within the Earth is generally achieved via seismic velocity anomalies (compressional and shear wave speeds). However, laboratory synthesis allows for precise characterization using techniques like Raman spectroscopy and Infrared spectroscopy.
   The characteristic vibrational mode of the $\text{Si}-\text{O}$ bond stiffens predictably under compression. For instance, the main Raman peak$(v_1)$ in …