In search for references about piezoelectricity of natrolite, we found mentioned the "water ferroelectricity". Dudka and coworkers, 2020, propose a study to obtain crystal structure refinement of natrolite, for what is regarding the localization of free water. "Traditionally, nanoinclusions (atoms or molecules) in minerals with pores and channels have been of interest for geologists. … Recently, researchers have been interested in these objects from the fundamental point of view, because inclusions may interact in a special way. In particular, the systems with inclusions in the form of polar water molecules have attracted attention. In the absence of chemical interaction, shortrange mutual ordering of the dipole moments of water molecules may occur because of the long-range electric dipole forces. This phenomenon may manifest itself in various (both inorganic and biological) systems. The ordered state of water molecules in a beryl crystal was revealed recently using spectroscopic analysis" . In general, "information about the characteristics of hydrogen atoms is important for studying the energy of atomic interactions in technological, biological, and pharmaceutical materials. … The most important problem of materials science is the development of hydrogen-storage devices, which may help in solving many climatic and ecological problems" . Concluding their work, Dudka and coworkers tell that "XRD analysis of water-containing mineral natrolite, which is a promising candidate for studying the water ferroelectricity by spectroscopic methods, was carried out [by them]. … The crystallo-chemical analysis revealed signs of weakness of the bonds of water molecules with the framework. … The obtained data on the orientation of water molecules, their motif, and degree of freedom of their vibrations made it possible to conclude that natrolite is a convenient object for studying the water ferroelectricity by spectroscopic methods" .