Parageorgbokiite, p-Cu₅0₂(Se0₃)₂Cl2, was found in the 2^nd cinder cone of the great fissure Tolbachik eruption (Kamchatka peninsula, Russia). The mineral occurs in association with ralstonitc, tolbachitc, melanothallite, chalcocyanitc, euchlorine, Fe oxides, tenorite, native gold, sophiitc, sulfates of Na, Ca, Mg, and some other copper sclcnitcs. Its formation temperature may be estimated as 400-625° C. Mineral has a green color, light-grccn streak, and vitreous luster. Brittle, Mohs' hardness 3-4. Cleavage none observed. Density (calculated) 4.70 g/cm³. Biaxial, optically poisitive. a = 2.05(1), p =2.05(1), у = 2.08(1), 2K_mcas ~ 0°, 2У_Ыс = 0(5)°. Optic orientation: X= a, other details unclear. Pleochroism: X, Y- grass-green, Z- yellowish-green. Empirical formula calculated on the base of О + CI = 10 is as following: Cu₄₉|Pb₀02Oi ₈б(5еОз)₂С12 м;