To predict how materials behave, one must first know their characteristics. Further, suppose you want to manipulate or design new materials and have them serve some technological purpose in, for example, electronic or photonic circuits. In that case, you need to understand the structural dynamics very, very well. Solid crystalline materials – such as metals, ceramics, rock, and bone – are notoriously difficult to model. They are made up of grains, domains, and defects and are challenged by many competing forces exerting their influence on several levels.

https://www.miragenews.com/researchers-capture-soundwaves-in-crystal-on-1095633/

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