The elastic symmetry and the coefficient of differential elastic anisotropy of the Sandstone crystalline crystals are investigated. The invariant-polarization method of researches is used in the work. Determination of the complete set of matrices of effective elastic constants made it possible to distinguish 2 groups of rocks with rhombic and triclinic groups of symmetries. Stereo projections of the index surfaces of the coefficient of differential elastic anisotropy underlined the various geological conditions for the formation of three groups of rocks previously identified.

It is proved that the three-line approximation in determining the parameters of elastic anisotropy of crystalline shales is optimal when calculating other parameters of the elastic anisotropy of a group of rocks of the Pishchanska iron-ore structure.


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