The X-ray single-crystal diffractometry of the mineral, Cattiite, has a cell that is "a" = 6.932(2) Å, "b" = 6.925(3) Å, "c" = 16.154(5) Å, α = 82.21(4)°, β = 89.70(4)°, γ = 119.51(3)°, V = 666.3(3) Å, and Z = 1.