More about ‘Flexoelectricity’ here:
https://www.nature.com/articles/s41567-025-02995-6
One more surprise in the ‘ice’ category … which is now up to 19 forms. (Know of any other solids which float on their liquid form?)
https://en.wikipedia.org/wiki/Phases_of_ice#Known_phases
“The details of the chemical nature of liquid water are not well understood; some theories suggest that its unusual behavior is due to the existence of two liquid states.” - WP
This one because the crystalline structure makes it so it can only be cleaved in this fascinating shape, and the strata make a really neat refraction pattern