Crystal is set of atoms connecting each other forming planes and angles. Crystal have known in 1 dimensional, 2 dimensional, and 3 dimensional respectively. Each of them have features that have been observed by scienties through long research all over the world. By the time, Scienties have been finding a lot of crystal array of diverse compound of atoms. In 2 dimensional is known rectangle, paralellogram, triangle, rhombic and hexagonal. In 3 dimensional is known 14 bravis lattice named cubic, monoclinic, triclinic, orthorombic, tetragonal, trigonal, hexagonal. Actually, they were determined by scientits based invention and experience. Basically, only cubic is main form of crystal subsequently was developed to a lot of form likely have mantioned.
In crystal growth research, we have found kind of configuration that was not appropriate with the theory but it just for initial because if we investigate it, we would find basic strutcture but it’s very complicated moreover extended structure. To assign shape of crystal, scienties probed by relation among one atom to other atoms. Mostly any central atom becoming reference or matrix to define the configuration.