TY JOUR TI From teaching experience. XVIII. Table of 27 symmetry species KW symmetry species and classes of crystals KW compositions of symmetry elements KW true and false inversion axes KW limiting Curie symmetry groups JO Vestnik of geosciences AU Voytehovskiy, Y.L. PY 2025 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"