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High concentrations of vanadium cause very unusual coloration in hibonite (purple) and grossite (light violet) crystals in an exotic mineral assemblage from Sierra de Comechingones (Argentina). In the hibonite (CaAl 12 O 19 ) structure vanadium ions, in various valence states (divalent, trivalent, and tetravalent), may be distributed over five crystallographic sites with coordinations corresponding to different polyhedra, namely, three unequal octahedra [ M 1 (D 3 d  ),  M 4 (C 3 v  ), and  M 5 (C  s  )], one  M 3 tetrahedron (C 3 v  ), and one unusual fivefold-coordinated trigonal bipyramid  M 2 (D 3 h  ). Possible locations of vanadium ions in grossite (CaAl 4 O 7 ) are limited to two crystallographically distinct sites ( T 1 and  T 2, both C 1 ) in tetrahedral coordination.

Vanadium-induced coloration in grossite (CaAl 4 O 7 ) and hibonite (CaAl 12 O 19 )