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Abstract
In this paper the effective non-destructive method of hydrothermal etching of crystals is considered to carry out estimation of density and place of dislocations in large scaled crystals of synthetic quartz. In this process of etching there are specific etch figures which appear as faceted holes of a millimetre up to several millimetres in size on all quartz facets. The size of holes depends on concentration of solution, duration of the process of etching and degree of solution saturation by silicon dioxide. The configuration of the holes on the facets of different indexes is various. Pits of symmetry, having facets, correspond to each facet there. Zcrystals are basic in quartz production. In sectional operation the expedients of defection of dislocations in pits generated on a facet are considered (0001).