What is the difference between silicon dioxide and ferroferric oxide?

Ferroferric oxide, chemical formula Fe3O4. Commonly known as iron oxide black, magnet, magnet and black iron oxide, it is a kind of magnetic black crystal, so it is also called magnetic iron oxide. It is soluble in acid solution, but insoluble in water, alkali solution and organic solvents, such as ethanol and ether.

Silicon dioxide is colorless and transparent crystal or amorphous powder, which is tasteless. The melting point is 17 10℃ (when applicable), 1670℃ (tridymite); The boiling point is 2230℃. A common acid that is almost insoluble in wat.

They are different chemicals, the former is an oxide and the latter is a covalent compound.