Low cutting rate and high tool wear are the important problems during excavating hard rocks. In order to find a solution for these problems, some investigations have been carried out by several researchers. One of the recent studies is the microwave assisted excavation of hard rocks. Revealing the impacts of microwave exposure on the minerals and micro-structures of rocks will be useful for the investigations on the microwave assisted hard rock excavation. In this research, the factors affecting the microwave heating of magmatic rocks were studied. First, the mineralogical analysis was carried out using the thin sections of the untreated specimens. Then, the specimens were exposed to microwaves at different power levels for varying durations. The surface temperature of the specimens was also measured using the infrared gun. After that, the mineralogical analysis was repeated for the treated specimens. The evaluation of the results shows that increasing microwave energy and radiation duration increases the surface temperatures of the tested specimens. The own mineral percentages of a specific specimen are the key factor for the heating degree. It was seen that the micro-structural changes in the specimens began at about the surface temperature of 100 °C. Very important micro-structural changes were observed in the specimens with metallic minerals and the minerals having metallic elements. It is concluded that the applied microwave power, the treatment time, and the mineral constitutes importantly influence the heating degrees of magmatic rocks irradiated with the microwave energy. The developed empirical equation can be used for the prediction of surface temperatures of the magmatic rocks using the percentages of quartz plus feldspar, the density and the porosity.

低开凿率和高工具磨损是开挖坚硬岩石过程中的重要问题。为了找到解决这些问题的方法，一些研究人员进行了一些研究。最近的一项研究是微波辅助的硬岩开挖。揭示微波暴露对岩石矿物和微观结构的影响，对于微波辅助硬岩开挖的研究将是有用的。在这项研究中，研究了影响岩浆岩微波加热的因素。首先，使用未经处理的试样的薄片进行矿物学分析。然后，将标本置于不同功率水平的微波中持续不同的时间。还使用红外枪测量样品的表面温度。之后，对处理过的标本重复进行矿物学分析。结果评估表明，增加微波能量和辐射持续时间会增加被测样品的表面温度。特定试样自身的矿物百分比是加热程度的关键因素。可以看出，样品的微观结构变化始于约100°C的表面温度。在含有金属矿物质和具有金属元素的矿物质样品中观察到非常重要的微观结构变化。结论是，施加的微波功率，处理时间和矿物对微波能量辐射的岩浆岩的加热程度具有重要影响。