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1. Quartzite

   Linked via "tectonic shearing"

   Acoustic Velocity and Hardness
   Due to its dense interlocking crystalline structure, quartzite possesses high P-wave seismic velocities, often exceeding $6.0 \text{ km/s}$ in unweathered samples. Its hardness on the Mohs scale is consistently high, typically registering $7$, although certain microfractures induced by ancient tectonic shearing can reduce localized resistance to $6.5$ [^4].
   Industrial and Cultural Applications