Oxides of iron and titanium are responsible for this.
Why does a magnet stick to granite.
Having dinner this evening around the granite kitchen worktop bar.
We have some useless fridge magnets shaped like giant clothespegs to clip notes reminders shopping lists to useless since they get knocked off the fridge fall to the floor and the magnet pops out of the casing.
If you bring rare earth magnet towards it the magnet attracts.
Probably magnetite an fe containing mineral.
Granite can be slightly magnetic.
Granite is intrusive which means that the magma was trapped deep in the crust and probably took a very long time to cool down enough to crystallize into solid rock.
Especially if it is mined from india.
But heat up the right type of stone to just the right temperature and you could end up with a magnet scientists now report.
Long before people invented the small magnets that stick to refrigerators or the big magnets that pick up cars at the junkyard people discovered natural magnets.