Table 1: Fitting results of fractal dimension for different magnification.

Rock typeMagnification 500Magnification 1000Magnification 2500Magnification 2500Average
RC RC RC RC

Grey diabase1.920.871.870.822.170.912.280.952.060.89
Black diabase1.950.891.850.802.200.902.120.932.030.88
Grey sandstone1.770.751.720.721.700.651.680.611.720.68
Red sandstone1.350.621.590.741.380.611.290.591.400.64