fig12

Figure 12. (A) Mechanically crushed quartz with few cracks and small black circles as mineral inclusions^[68]; (B) Quartz after current pulse crushing with many cracks and extensions around mineral inclusions; (C) Electrical resistance of different minerals: 1. Quartzite 2. Porphyry 3. Insulating oil 4. Dali Rock 5. Shale 6. Sandstone 7. Non-purified water^[69].