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A crystal structure is a concept fundamental to many areas of science and technology. Along with the unit cell lattice parameters, its space group[?] symbol and the positions of the atoms entirely describe a crystal structure.
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The simplest and most symetrical, the isometric system, is represented by the cube. The other six systems, in order of decreasing symetry, are hexagonal, tetragonal, trigonal[?], orthorhombic[?], monoclinic[?] and triclinic[?].
There are 14 basic arrangements of atoms in three dimensions, and all cristalline mineral structures recognised till now fit in one of these 14 arrangements.
The fourteen basic structure of minerals are the following:
The set of atomic positions (xi, yi, zi) are called the asymmetric unit.
Crystal for a general definition and overview -- Crystallography -- Crystallographic defects
For more detailed information in specific technology applications see materials engineering,materials science, ceramics, metallurgy, or materials physics.
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