A crystal in which the unit cell is a cube (see crystal system). There are three possible packings for cubic crystals: simple cubic, face-centred cubic, and body-centred cubic.
http://www.chemtube3d.com/solidstate/_simplecubic(final).htm An interactive version of a simple cubic crystal
http://www.chemtube3d.com/solidstate/_bcc(final).htm An interactive version of a body-centred cubic crystal
http://www.chemtube3d.com/solidstate/_ccp(final).htm An interactive version of a face-centred cubic crystal