We report the experimental observation of magnetochiral anisotropy in the longitudinal and transverse ultrasound propagation in $\alpha$ quartz. To perform such measurement, we have built an ultrasound spectrometer with unprecedented experimental resolution of the order of $\mathrm{\Delta }v/v\sim {10}^{-8}$. We present a simple macroscopic Becquerel-like analytical model that accounts for the magnitude of the observed effect and its frequency dependence.

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• Chirality
• Non-reciprocal propagation
• Phonons