}} | Section2 = | Section3 = | Section4 = | Section7 = | Section8 = }} Thorium dioxide (ThO2), also called thorium(IV) oxide's a white, crystalline powder. It was formerly known as thoria or thorina. It's produced mainly as a by-product of lanthanide and uranium production[1]. Thorianite's the name of the mineralogical form of thorium dioxide. It's moderately rare and crystallizes in isometric system. Chemistry The compound's radioactive due to the radioactivity of thorium. Thorium dioxide can… (More on Thoria)