Editing Cubic crystal system (section)

===Fluorite structure===
{{main|Fluorite structure}}
{{Category see also|Fluorite crystal structure}}
Much like the rock salt structure, the [[fluorite structure]] (AB<sub>2</sub>) is also an Fm{{overline|3}}m structure but has 1:2 ratio of ions. The anti-fluorite structure is nearly identical, except the positions of the anions and cations are switched in the structure. They are designated [[Wyckoff positions]] 4a and 8c whereas the rock-salt structure positions are 4a and 4b.<ref>{{Cite web|title=Fluorite|url=http://aflow.org/CrystalDatabase/AB2_cF12_225_a_c|website=aflow.org|access-date=2020-05-22}}</ref><ref>{{Cite web|title=Rock Salt|url=http://aflow.org/CrystalDatabase/AB_cF8_225_a_b.html|website=aflow.org|access-date=2020-05-22}}</ref>