Can there be a child without a parent? No, the child depends on the parent to exist. Can there be a parent without a child? No, if there is no child then there can be no parent so the parent also depends on the child to exist. Parent and child are mutually codependent. Neither can exist without the other.
I would count mind as one part of reality, not separate from it. Did you mean mind and materiality?
Do not confuse “empty” with nothingness. The real that we sense is real, but only conventionally, dependently contingently real. There is no underlying layer of “real reality” underneath it. That supposed underlying layer is a pure mental construct only found inside our heads.
The emptiness of emptiness is the fact that not even emptiness exists ultimately, that it is also dependent, conventional, nominal, and in the end it is just the everydayness of the everyday. Penetrating to the depths of being, we find ourselves back on the surface of things and so discover that there is nothing, after all, beneath those deceptive surfaces. Moreover, what is deceptive about them is simply the fact that we assume ontological depth lurking just beneath.
– Jay Garfield, “Empty words, Buddhist philosophy and cross-cultural interpretation.” OUP 2002.
What is empty is the idealised Thomist ‘Substance’. There is only ‘Accident’. The error is to mistake one for the other.
HTH
rossum