Goniometric study. For measurements, the crystals were adjusted to the most developed belt, indicated on the attached diagram by the symbol [0121]. A total of 17 crystals were measured, of which six were taken to calculate the φ and β coordinates (see article). An optical study of 1-phenyl-2-parachlorophenyl-3-phenyl-imidoxantide crystals on a universal stage by E. S. Fedorov established the following arrangement of the axes of the optical ellipsoid: the NgNp plane coincides with the cleavage plane (1000), Np coincides with the direction of the crystal elongation, i.e. e. [0121].
