This is a non-diffusing subcategory of Category:Orthorhombic minerals. It includes minerals that can also be found in the parent category, or in diffusing subcategories of the parent.

This category lists minerals that display the Cmcm (No. 63) space group symmetry of the orthorhombic crystal system. This also includes Amam, Amma, Bbmm, and Bmmb.