I know it's not your fault, but you don't seem to be able to spot the difference between a thinking troll and an ordinary rock.

Not just ordinary rock, a kind that has some of the fire-essence in it.

From here, the gem that had built empires looked like an ordinary rock.

It turned out to be an ordinary rock from the asteroid belt.

Together, these gave a sound far removed from her initial folk roots and much closer to ordinary rock.

One shows the spectrum of ordinary rocks and minerals as found on many worlds.

They look like ordinary rocks and pebbles when they're found.

These stones were as dead in that respect as any ordinary rock.

He withdrew his hand holding what appeared to be an ordinary rock.

Common, ordinary rock became a monstrous atomic pile where it was turned on.