- The reason Vision could phase was not because of the mind-stone. His body is made entirely of Vibranium, and he can adjust his density at will. He can turn his density so low that he can phase through things. I know this does not make a lot of sense in terms of how physics actually works, but think of it as him vibrating his molecules just perfect a la Flash.
- When Thanos phases Banner+HB into a rock, he has the entire gauntlet(literally) at his disposal. There are numerous ways he could fuse their powers to achieve it. He could use the space stone to teleport banner into the rock, he could use the reality stone to blend him into it. Both are equally probable. Both of them can have their powers boosted by the power stone, making it very easily possible.
In essence, Visions powers and Banners fate are not correlated.They were the manifestation of entirely different things.
The infinity stones do not inherently have secondary powers.
But the wielder could potentially use the stones original power to great effect with a dash of creativity and understanding of the stones power.
This takes us to some grey areas. For example, the wielder of the Reality Stone could make some person think they were in space, without physically teleporting them. Does that mean the Reality Stone could recreate the power of the Space Stone? No.
Now potentially, one could use the Mind Stone to make a person think they were in space. But is it really recreating the power of the Space or Reality Stone? No.