Warwickite

General Information: Chemical Formula:Mg(Ti,Fe+++,Al)(BO3)O Composition:(Molecular Weight = 206.10 gm)Magnesium 11.79 % MgTitanium 13.94 % TiAluminum 1.31 % AlIron 8.13 % FeBoron 10.49 % B Oxygen 54.34 % O  Empirical Formula: MgTi0.6Fe3+0.3Al0.1(BO3)O Locality:Southwest of Edenville, in the town of Warwick, Orange Co., New York. Name Origin:Named after its locality.Physical Properties: Cleavage:[100] Perfect Color:brown or black. Density:3.36 Diaphaniety:Transparent to Subtranslucent Habits:Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Crystalline - Fine - Occurs as well-formed fine sized crystals., Hardness:3-4 - Calcite-Fluorite Luminescence:Non-fluorescent. Luster:Vitreous - Silky Streak:bluish blackMore details...