What is meant by 'stones' in al-Baqara 2:24?

What is meant in the Qur'an by > If you cannot do this, and you never will, then beware of the Fire prepared for the disbelievers, the fuel of which is man and stones. > > — [Quran 2:24](https://quran.com/2/24) The "man and stones" phrase is what is confusing me. Does this simply mean that the fire is fueled by stones. Does this encourage stoning or is there a meaning I'm not seeing? Thanks.