Full Idea
Descartes' dualism combines substance dualism and property dualism; two disparate domains of substances, and two mutually exclusive families of properties.
Gist of Idea
Descartes is a substance AND property dualist
Source
report of René Descartes (Meditations [1641], §6.78) by Jaegwon Kim - Philosophy of Mind p.211
Book Reference
Kim,Jaegwon: 'Philosophy of Mind' [Westview 1998], p.211
A Reaction
I would have thought that substance dualism entailed property dualism. How would you distinguish two substances from one another except by their properties? There seems a merely logical possibility that God gives two substances the same properties.