Do rocks have consciousness?
I would say no, but it's definitely a matter of perspective and definition. I would argue that all animals with a nervous system at the very least have something that we could recognize as consciousness. not harming any of them would be a difficult proposition. Especially for a pantheist, not harming any of God's creatures id likely not possible. Rocks come from the same stuff as you and me. Consciousness is an idea, a matter of language. That's where the problem lay.
I'd say that if they're made of the same stuff, and if we say we have consciousness, then so does anything made up of the same stuff.
Tough question. I would say that it's an undeniable fact that the universe is aware of itself (at least insofar as we're aware that the universe exists, and we're certainly a part of it). Whether this extends to things we don't understand, well, who can say. I think we should never be so bold as to say X doesn't happen solely on the basis that we have never observed X. Scientists do that all the time, and it's really annoying. The correct statement is, "We've never observed X." My point is that it sounds weird to ascribe consciousness to individual inanimate objects, but in some sense the universe itself can be said to be conscious. That said, I don't think anyone should feel bad for grinding up rock to make concrete.