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If the reaction is performed in the fluorspar tube, the resulting gaseous silicon tetrafluoride, SiF4, may be collected over mercury.

Silicon dioxide, one of the most inert of substances at the ordinary temperature, takes fire in the cold in contact with fluorine, becoming instantly white-hot, and rapidly disappearing in the form of silicon tetrafluoride.

When warmed in a glass vessel, the latter becomes etched, owing to the formation of silicon tetrafluoride, SiF4.