Orientable Blackstone

Deepslate can be placed on it's side, allowing for the lighter and softer "top" texture to be used in walls and other builds. Blackstone also has a lighter and softer "top" texture, but it cannot be placed on it's side like deepslate, if we could place it on it's side, we would have some more options for things like walls and gradients in building. That is why I want blackstone to be orientable like deepslate, a minor but neat thing to add to a build.