The regularity of intergrowth of elemental fibrous in fibrous- needle materials using X-ray photographic methods investigation of single-crystals was studied. There are the next variants of its formations: 1) single crystal fibrous, 2) twin fibrous crystals, 3) statistical intergrowth of polycrystals around the c axis - "texture of rotations". It was obtained a method to determinations of desorientations of elemental fibrous relative elongation axis c for all formations cases.
A streak-graphic reflections on the X-ray rotated patterns because of indicated axial desorientation of fibrous are observed. The degree of desorientation (r) is determinate as proportional to the altitude of streak-graphic reflects hk0, according to r=arctg(H-d)/D, where H -altitude of reflections, d- diameter of X-ray beam, D- diameter of X-ray camera. While the direction of fibrous desorientation [hk0] - corresponds to v=arctg(h*b)/(k*a), where h,k-crystallographic indexes of reflections; a,b- unit cell parameters [1].
The scheme diagrams of desorientation for synthetic monoclinic and rhombic amphiboles, and also pyroxenes, rutile and Li,Mg-pseudo- brucite is discussed. Diagrams contents the information about peculiarity to cleavage of this materials.
1. Ansheles O.M.: Crystallographic computing and graphic methods. Leningrad University Press, 1939, 300 p.