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Definition of crystal form

i. The form or shape in which crystals naturally grow; eg. the cube, the octahedron, and others.

ii. All crystal faces related by the symmetry elements of the point group of the crystal structure belong to the same crystal form. Crystal forms are designated by the indices of the unit face enclosed in braces, e.g., hkl . Forms are closed if they singly enclose a volume and open if two or more forms are required. The terms 'prism,' 'pyramid,' 'cube,' 'octahedron,' and 'tetrahexahedron' refer to crystal forms. A crystal form is ideal when all faces are the same size.

Synonym of: crystalline form


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