lode·stone
[ˈlōdˌstōn]

NOUN
loadstone (noun)
a piece of magnetite or other naturally magnetized mineral, able to be used as a magnet.
synonyms: lodestone · magnetite · field magnet · bar magnet · horseshoe magnet · transverse magnet · electromagnet · electret · solenoid · diamagnet · antiferromagnet · magnetoid · wiggler
a naturally magnetized mineral; magnetite.
a thing that is the focus of attention or attraction.
“the revolution in eastern Europe has robbed the state of its ideological lodestone”