A study of the mechanism of uptake and conversion of microwave energy into heat energy is presented. The term " SHF-trigger”, which activates at the atomic, electronic, and molecular scales, is introduced for the mechanism of microcracking, destruction, and crashing of quartz-containing rocks. It has been found that the uptake and conversion of microwave energy into heat energy begins there were some criteria of the sample establishment in energy consumption are satisfied. This mechanism of the energy conversion with the heating effect differs from other modes of heating by its efficiency; accordingly, a special criterion is required. The loss tangent of a dielectric, such as mineral or heterogeneous rock, could serve as a measured parameter. This parameter is attributed to slowly establishing modes of relaxation, which manifest themselves in the presence of polar molecules< complex anion radicals, chemically bound water, solid/liquid interfaces, borders of dielectrics and conductors. In addition, a new mechanism of conversion of microwave energy into heat energy in points of contact between water-saturated pores in model specifications.

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