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The crystal structure of chromian kassite from the Saranovskoye deposit, Northern Urals, Russia
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I.E. Grey
,
W.G. Mumme
Published/Copyright:
March 31, 2015
Abstract
The crystal structure of kassite, ideally Ca[Ti2O4(OH)2], containing 2 wt% Cr2O3, 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[Ti2O5(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 P21/a. Kassite, CaTi2O4(OH)2, and cafetite, CaTi2O5(H2O), are identical chemically but significantly different in their crystal structures
Received: 2002-10-27
Accepted: 2003-3-24
Published Online: 2015-3-31
Published in Print: 2003-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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