Fergusonite-(Y)

General Information: Chemical Formula:YNbO4 Composition:(Molecular Weight = 245.81 gm)Yttrium 36.17 % Y Niobium 37.80 % NbOxygen 26.04 % O  Empirical Formula: YNbO4 IMA Status:Approved IMA 1987Physical Properties: Cleavage:[???] Indistinct Color:black, black, brown, gray, or yellow. Density:4.3 - 5.8, Average = 5.05 Diaphaniety:Subtranslucent to opaque Hardness:5.5-6 - Knife Blade-Orthoclase Luminescence:Non-fluorescent. Luster:Sub Metallic Streak:brownMore details...