%0 Journal Article %T From teaching experience. XII. The origin of the crystal and the principle of equal immediate environment %A Voytehovskiy, Y.L. %K crystallography, mineralogy, nucleus, crystal, symmetry, polyhedral cluster, principle of equal immediate environment %J Vestnik of geosciences %D 2023 %N 0 %P 3 %I FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"