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The crystal structure of kassite, ideally Ca[Ti 2 O 4 (OH) 2 ], containing 2 wt% Cr 2 O 3 , from the Saranovskoye chromite deposit, Perm’ district, Northern Urals, has been determined and refined to R1 = 0.06 using single crystal X-ray diffraction data. The crystals have monoclinic symmetry, P21/a, with a = 5.275(1), b = 9.009 (2), c = 9.557 (2) Å, β = 90.43∞. A pronounced sub-structure for the mineral, conforming to space group I2/a, is related to the I2/a structure for lucasite-(Ce), Ce[Ti 2 O 5 (OH)]. It comprises (001) layers of gibbsite-like fused hexagonal rings of edge-shared Ti(O,OH) 6  octahedra with the Ca atoms sandwiched between pairs of opposing rings and displaced from the center of the rings along [010]. Ordering of the protons in chromian kassite lowers the symmetry to P2 1 /a. Kassite, CaTi 2 O 4 (OH) 2 , and cafetite, CaTi 2 O 5 (H 2 O), are identical chemically but significantly different in their crystal structures

The crystal structure of chromian kassite from the Saranovskoye deposit, Northern Urals, Russia