Full Idea
In Epicurean atomism (of Cordemoy, for example) there is a world of basic things distinguished by virtue of their extreme hardness.
Gist of Idea
Epicurean atoms are distinguished by their extreme hardness
Source
Daniel Garber (Leibniz:Body,Substance,Monad [2009], 2)
Book Reference
Garber,Daniel: 'Leibniz: Body, Substance, Monad' [OUP 2009], p.81
A Reaction
Garber says that Leibniz espouses 'substantial atomism', which is different from this. Leibniz's atoms have active power, where these atoms just embody total resistance.