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Pieczka, A., Evans, R.J., Grew, E. S., Groat, L.A., Ma, C and Rossman, G.R. (2013) The dumortierite supergroup. II. Three new minerals from the Szklary pegmatite, SW Poland: Nioboholtite, (Nb0.6vac0.4)Al6BSi3O18, titanoholtite, (Ti0.75vac0.25)Al6BSi3O18, and szklaryite, vacAl6BAs3+3O15. Mineralogical Magazine, 77, 2841-2856.