A mineral that can act as a magnet?

Magnetite is a mineral that can act as a magnet due to its strong magnetic properties. It is an iron oxide (Fe3O4) and is one of the main ores of iron. Magnetite exhibits ferromagnetism, meaning it can become magnetized in the presence of a magnetic field and retain that magnetism even after the field is removed. This property makes it useful in various applications, including magnetic storage media and compasses.