Pure Cerium will spark and ignite if scratched by a soft object. Therefore most of the practical uses come out of the oxide form. It is also used in a component called Misch Metal, which is very important in making flint for lighters.
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The Elements 
Your design for cerium fits its description and looks so exciting and sparkly. It is also good to see your smiling face and the publication of just one little bit of your outstanding work!