Orthorhombic crystal system

A crystal system with three mutually perpendicular axes that are not constrained by symmetry to have equal lengths.

A Bravais lattice with three perpendicular conventional axes and lattice points at $(0,0,0)$ and $(1/2,1/2,0)$. A translation by half a diagonal of an $ab$ face preserves the complete crystal motif; apparent centering of unlabelled molecular centers alone is insufficient.