1.Appearance:Black or brown powder 2.Formula:Pr6O11 3.Use:used as the raw material in making ceramic col Character: black powder, density 6.88 g/cm3,melting point 2042 °CInsoluble in water, soluble in acid generation trivalent salts. Conductivity good1.Appearance:Black or brown rare earth oxide powder2.Formula:Pr6O113.Use:used as the raw material in making ceramic colorants,metal praseodymium ,as ...