x-axis


a. The axis of abscissas in a plane Cartesian coordinate system. Commonly written x-axis. Webster 3rd
b. One of the three optic axes (x, y, and z) in a biaxial crystal. The x-axis is the axis of a greatest ease of vibration. Light vibrating parallel to the x-axis travels with maximum velocity and is called the fast ray, the x-ray (not to be confused with the penetrating X-rays of extremely short wavelength), and the alpha -ray. The lowest index of refraction nalpha . in biaxial minerals is the index of the fast ray vibrating parallel to the x-axis.
c. One of three axes in a three-dimensional coordinate system. Crystallographers customarily use a right-handed system with the z-axis oriented positive upward, the y-axis positive to the right, and the x-axis positive toward the viewer. For mineral parameters the x-axis is labeled a with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t with periodic translations t (sub 1.
Source:
Dictionary of Mining, Mineral, and Related Terms












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