[en] One of the actual problems of radiation solid-state physics relates with finding the dependence of mechanisms (elastic or inelastic) of point defect production, structure transformations and other radiation effects in wide-gap oxides on the kind of energy losses, charge particle energy and beam intensity. In this work we studied absorption and luminescence spectra of quartz crystals prior and after irradiations with 18 MeV-protons (p), 16 MeV-deuterons (d), 18 MeV α -particles with an over-threshold energy >E_t and electrons with a sub-threshold energy < E_t to various fluences (φ) accumulated at different beam current densities (j). The absorption and luminescence bands, appearing upon the same φ of p-, d- and α-particles but different j, are attributed to defects of α - and β -quartz and amorphous phase. The higher the j and mass of the particles are, the higher the intensities of the induced bands are. It seems to be due to increasing the efficiency of both the point defect production and other phase precipitates at the expense of inelastic energy losses of the impact particles, which is spent on electronic excitations (EΙ). It was first found, that the optical bands appear in the crystals irradiated with the φ=10¹⁶ cm^-2 of 100-120 keV electrons only within a particular range of j. Since the damaged volume of the irradiated crystal remains constant, the j increase results in growing the EΙ concentration. In the range of j when there is no interaction between EΙ , the energy released at EΙ decay is not enough for creation of stable structure defects. At some critical j_c the EΙ concentration becomes so high that EΙ begin interacting and upon their collective decay the released energy is already enough for the defect stabilization. The following increase of j results in growing the structure damage degree and the number of interacting EΙ that decreases the energy and increases the efficiency of point defect production. When reaching some high j the interacting EΙ cover the whole damaged volume and the energy released at their decay is enough for creating thermal peaks, where generation of other quartz phases begins. These precipitates contain intrinsic defects, which promote formation of β-quartz and amorphous phase with growing j. The work was supported by the grant F2.1.17 from the Center of Sciences and Technology of Uzbekistan. (author)