Linked from
The 17 pages that link to Cubic crystal system, each with the reason it gives.
PyriteRelated: Pyrite’s crystals commonly develop cubic symmetry.
SylviteRelated: Sylvite crystallizes in this highly symmetric system.
CryoliteRelated: Cryolite crystallizes in a cubic structure under ordinary conditions.
SpinelRelated: Spinel crystallizes in this system, giving its crystals characteristic symmetry.
SodaliteRelated: Sodalite crystallizes in this system, giving its framework cubic symmetry.
Zirconium dioxideRelated: Dopants can retain zirconia's cubic phase at low temperatures.