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Crystal system
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===Two-dimensional space=== In two-dimensional space, there are four crystal systems (oblique, rectangular, square, hexagonal), four crystal families (oblique, rectanguar, square, hexagonal), and four lattice systems ([[oblique lattice|oblique]], [[rectangular lattice|rectangular]], [[square lattice|square]], and [[hexagonal lattice|hexagonal]]).<ref name="Giacovazzo">{{cite book |last1=Giacovazzo |first1=Carmelo |title=Fundamentals of Crystallography |date=10 February 2011 |publisher=Oxford University Press |isbn=978-0-19-957366-0 |edition=3rd}}</ref><ref name="ITA">{{cite book |last1=Hahn |first1=Theo |title=International Tables for Crystallography Volume A: Space-Group Symmetry |date=2005 |publisher=Springer |location=Table 2.1.2.1 |edition=5th}}</ref> {|class="wikitable" style="margin: 1em auto; text-align: center;" |- ! Crystal family ! Crystal system ! Crystallographic point groups ! No. of plane groups ! Bravais lattices |- ! Oblique (monoclinic) | Oblique | 1, 2 | 2 | ''mp'' |- ! Rectangular (orthorhombic) | Rectangular | ''m'', 2''mm'' | 7 | ''op'', ''oc'' |- ! Square (tetragonal) | Square | 4, 4''mm'' | 3 | ''tp'' |- ! Hexagonal | Hexagonal | 3, 6, 3''m'', 6''mm'' | 5 | ''hp'' |- | '''Total''' | 4 | 10 | 17 | 5 |}
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