“…Compounds with the usovite-type structure are represented by the general formula Ba 2 (M II 1)(M II 2)(M III 3) 2 F 14 (M II 1 = Ca, Cd, Mn; M II 2 = Mg, Co, Mn, Cu, Cd, Fe; M III 3 = Al, V, Fe, Cr, Ga, Mn) and crystallize with four formula units in the space group C2/c. Most of the usovite-type representatives known so far were prepared and structurally determined by Babel, Tressaud and co-workers over the last three decades (Holler et al, 1984(Holler et al, , 1985Kaiser et al, 2002;Le Lirzin et al, 1990, 1991, 2008Qiang et al, 1988).…”