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Q. Like et alii, Frattura ed Integrità Strutturale, 34 (2015) 543-553; DOI: 10.3221/IGF-ESIS.34.60 549 decreased effectively by blindly increasing microwave power density. When the power density exceeds a threshold value, the excessive power density will increase the equipment cost. Fig. 6 Relationship between failure around mineral boundary and irradiation time. Fig. 7 Relationship between irradiation time and power density when the failure rate is 95%. Fig. 8 Relationship between energy consumption and power density when the failure rate is 95%. Effect of mineral content on rock failure state Fig. 9 depicts the stress state for different mineral contents when the power density reaches 7×10 9 W/m 3 and irradiation time is 20 ms. As shown in the figure, the mineral contents are different; however, at the same irradiation time, the