Experimental Investigation on Hard Rock Breaking with Fiber Laser: Surface Failure Characteristics and Perforating Mechanism

Table 5

Compositions of sandstone before and after laser perforation.

	Quartz (%)	Potassium-feldspar (%)	Plagioclase (%)	Calcite (%)	Hematite (%)	Laumontite (%)	Clay (%)
Sandstone	37.0	6.2	42.7	2.3%	3.3	0.9	7.6
Lased	13.8	1.8	57.4	–	7.4	–	19.6