Structural Characteristics and Physical Properties of Tectonically Deformed Coals

Figure 3

SEM and optical microscopy images of TDCs (a) cataclastic structure coal, multidirectional fracture cutting, and no obvious displacement in the blocks, SEM; (b) mortar structure coal, multidirectional fracture cutting, and obvious displacement in the blocks, SEM; (c) schistose structure coal, single directional fracture, and little displacement on its surface, SEM; (d) wrinkle structure coal; coal was wrinkled, and later superimposed by brittle fractures, SEM; (e) cataclastic structure coal with the structural fractures filled with calcite veins, optical microscopy; (f) cataclastic structure coal with the structural fractures expanded the cleats, SEM.