crystallographic form

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• Form — (f[=o]rm; in senses 8 & 9, often f[=o]rm in England), n. [OE. & F. forme, fr. L. forma; cf. Skr. dhariman. Cf. {Firm}.] 1. The shape and structure of anything, as distinguished from the material of which it is composed; particular disposition or… …   The Collaborative International Dictionary of English

• Crystallographic restriction theorem — The crystallographic restriction theorem in its basic form was based on the observation that the rotational symmetries of a crystal are usually limited to 2 fold, 3 fold, 4 fold, and 6 fold. However, quasicrystals can occur with other symmetries …   Wikipedia

• Crystallographic defect — Crystalline solids exhibit a periodic crystal structure. The positions of atoms or molecules occur on repeating fixed distances, determined by the unit cell parameters. However, the arrangement of atom or molecules in most crystalline materials… …   Wikipedia

• Crystallographic defects in diamond — Synthetic diamonds of various colors grown by the high pressure high temperature technique, the diamond size is 2 mm …   Wikipedia

• Crystallographic database — A crystallographic database is a database specifically designed to store information about crystals and crystal structures. Crystals are solids having, in all three dimensions of space, a regularly repeating arrangement of atoms, ions, or… …   Wikipedia

• Crystallographic point group — In crystallography, a crystallographic point group is a set of symmetry operations, like rotations or reflections, that leave a central point fixed while moving other directions and faces of the crystal to the positions of features of the same… …   Wikipedia

• form — formable, adj. formably, adv. /fawrm/, n. 1. external appearance of a clearly defined area, as distinguished from color or material; configuration: a triangular form. 2. the shape of a thing or person. 3. a body, esp. that of a human being. 4. a… …   Universalium

• Bad form — Form Form (f[=o]rm; in senses 8 & 9, often f[=o]rm in England), n. [OE. & F. forme, fr. L. forma; cf. Skr. dhariman. Cf. {Firm}.] 1. The shape and structure of anything, as distinguished from the material of which it is composed; particular… …   The Collaborative International Dictionary of English

• Good form — Form Form (f[=o]rm; in senses 8 & 9, often f[=o]rm in England), n. [OE. & F. forme, fr. L. forma; cf. Skr. dhariman. Cf. {Firm}.] 1. The shape and structure of anything, as distinguished from the material of which it is composed; particular… …   The Collaborative International Dictionary of English

• Space form — In mathematics, a space form is a complete Riemannian manifold M of constant sectional curvature K . Reduction to generalized crystallographyIt is a theorem of Riemannian geometry that the universal cover of an n dimensional space form M^n with… …   Wikipedia

• superconductivity — superconduction /sooh peuhr keuhn duk sheuhn/, n. superconductive /sooh peuhr keuhn duk tiv/, superconducting, adj. superconductor /sooh peuhr keuhn duk teuhr/, n. /sooh peuhr kon deuhk tiv i tee/, n. Physics. the phenomenon of almost perfect… …   Universalium