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- One of the three crystallographic axes used as reference in crystal description. It is oriented horizontally, front to back.
- One of the three reference axes used in describing a rock fabric possessing monoclinic symmetry, such as progressive simple shear. The a axis is the direction of tectonic transport, i.e., the direction of shear. Syn: a direction CF: b axis; c axis.
Source: Dictionary of Mining, Mineral, and Related Terms