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.