Vuagnatite

General Information: Chemical Formula:CaAlSiO4(OH) Composition:(Molecular Weight = 176.15 gm)Calcium 22.75 % CaAluminum 15.32 % AlSilicon 15.94 % SiHydrogen 0.57 % H Oxygen 45.41 % O  Empirical Formula: CaAl(SiO4)(OH) IMA Status:Approved IMA 1976Physical Properties: Cleavage:[???] Perfect Color:colorless, white, or light pink. Density:3.2 - 3.25, Average = 3.22 Diaphaniety:Transparent to Translucent Hardness:6 - Orthoclase Luster:Vitreous (Glassy) Streak:whiteMore details...