ada 7 sistem kristal yaitu kubus, tetragonal, triklinik, ortorombik, monoklinik, heksagonal, dan rhombohedral<!--'''Sistem kristal''' is the [[point group]] of the lattice (the set of rotation and reflection symmetries which leave a lattice point fixed), not including the positions of the atoms in the unit cell. There are seven unique crystal systems. The simplest and most symmetric, the [[cubic (crystal system)|cubic]] (or isometric) system, has the symmetry of a [[Cube (geometry)|cube]]. The other six systems, in order of decreasing symmetry, are [[Hexagonal (crystal system)|hexagonal]], [[tetragonal]], [[rhombohedral]] (also known as trigonal), [[orthorhombic]], [[monoclinic]] and [[triclinic]]. Some crystallographers consider the hexagonal crystal system not to be its own crystal system, but instead a part of the trigonal crystal system.-->
Ada 7 sistem kristal unik, yaitu menurut penurunan simetri:
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# [[Sistem kristal kubik|kubus atau kubik]]
# heksagonal
# tetragonal
# rhombohedral (trigonal)
# ortorombik
# monoklinik
# triklinik
Sistem yang paling sederhana dan paling simetrik adalah [[sistem kristal kubik]] yang mempunyai simetri sebuah [[kubus]].
Sejumlah ahli [[kristalografi]] ("kristalografer") menganggap sistem kristal heksagonal bukan sistem tersendiri melainkan termasuk ke dalam bagian sistem kristal trigonal.
