Rocks that contain incompetent (mechanically weak) minerals such as micas and more competent (mechanically stronger) minerals such as quartz or feldspars, may develop a shear band fabric.<ref name=GoodwinTikoff /><ref name=Japan /> The [[incompetent mineral]]s will preferentially form the C-surfaces and competent minerals will form along the S-surfaces.<ref name=GoodwinTikoff /><ref name=Japan />
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Rocks that contain incompetent (mechanically weak) minerals such as micas and more competent (mechanically stronger) minerals such as [[quartz]] or feldspars, may develop a shear band fabric.<ref name=GoodwinTikoff /><ref name=Japan /> The [[incompetent mineral]]s will preferentially form the C-surfaces and competent minerals will form along the S-surfaces.<ref name=GoodwinTikoff /><ref name=Japan />