Texture (geology)
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In geology, texture or rock microstructure refers to the relationship between the materials of which a rock is composed. The broadest textural classes are crystalline, fragmental, aphanitic, and glass
Texture in a thin section of mylonitic quartzite from the Alps, Italy
Texture in a thin section of tholeiitic basalt
Graphic granite from Norway
Crenulation
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In a geological context, crenulation or crenulation cleavage is a fabric formed in metamorphic rocks such as phyllite, schist and some gneiss by two or more stress directions causing the formation of
Example of a large-scale crenulation forming kink-folds, Nathans Mine, Glengarry Basin, W.A., showing the superposition of F5 foliation on earlier F3-F4 foliation. A mechanical pencil is seen for scale comparison.