Concept information
Preferred term
Monoclinic
Definition
- 1. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic system. They form a parallelogram prism. Hence two pairs of vectors are perpendicular (meet at right angles), while the third pair makes an angle other than 90°. (Wikipedia). 2. Crystals in this system are referred to three axes of unequal lengths—say, a, b, and c—of which a is perpendicular to b and c, but b and c are not perpendicular to each other. monoclinic crystal system monoclinic crystal systemCrystals in a monoclinic system are referred to three axes of unequal lengths, with two axes being perpendicular to each other. If the atoms or atom groups in the solid are represented by points and the points are connected, the resulting lattice will consist of an orderly stacking of blocks, or unit cells. The monoclinic unit cell is distinguished by a single axis, called an axis of twofold symmetry, about which the cell can be rotated by 180° without changing its appearance. More solids belong to the monoclinic system than to any other. Beta-sulfur, gypsum, borax, orthoclase, kaolin, muscovite, clinoamphibole, clinopyroxene, jadeite, azurite, and spodumene crystallize in the monoclinic system. This article was most recently revised and updated by John P. Rafferty. (Britannica). 3. Constituting a system of crystallization characterized by three unequal axes with one oblique intersection (Merriam-Webster dictionary). 4. The monoclinic structure has two unit cells. The primative cell (P) has fractional lattice points at the corners of the cell, and the base-centered cell (C) has additional fractional lattice points at the center of the basal planes of the unit cell. The primative cell has one lattice point associated with it. The base-centered cell has two lattice points. The constraints on the primative vectors and angles for this system are: a < b < c; a = g = 900, b may not be 900. (https://www.princeton.edu/~maelabs/mae324/glos324/monoclinic.htm).
Broader concept
URI
https://purls.helmholtz-metadaten.de/evoks/sdv/Monoclinic
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