a. In crystallography, a symmetrically unique reference vector, oriented vertically by convention. In the monoclinic system, the second setting orients the c axis at the nonorthogonal angle beta to the unique b axis, the diad. In the triclinic system, all axes are unique with the c axis designated by convention. CF: a axis; b axis.
b. One of three orthogonal reference axes, a, b, and c that are used in structural geology.
c. To help describe the geometry of a fabric that possesses monoclinic symmetry, the c axis lies in the unique symmetry plane at right angles to a prominent fabric plane; thus in many tectonites the c axis is normal to the schistosity.
d. In a kinematic sense, to describe a deformation plan that possesses monoclinic symmetry, such as a progressive shear. Here the c axis lies in the unique symmetry plane and normal to the movement plane. In a progressive simple shear, the c axis lies normal to the shear plane. Syn: c direction
Source:
Dictionary of Mining, Mineral, and Related Terms












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