what is the mineral iron?
Hemetite is one common form, though there are many others, if you mean how does iron ore occur naturally. If you are actually asking what Iron is, it is an element, found very commonly on the earth's crust and believed to be a major component of the earth's core, used to make magnets and steel.
Don't let it sleep with you at night. They're not big chewers but they do nibble.
