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One of the seven crystal systems, with two sets of edges of the same length and a third which is either longer or shorter than the other two. The lattice may be referred to three crystallographic axes, a1, a2, and c (or x, y, and z) where a1 and a2 (or x and y) are equal, and c (or z) may be longer or shorter. All three axes are at right angles.


Subjects: Earth Sciences and Geography.

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