The Monoclinic reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Monoclinic

A crystal system is described by at least three vectors. A monoclinic crystal is a crystal is described by vectors with unequal length. Two of them are at right angles to each other, while the third is lies at an angle other than 90°.

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