Back in the day, we used to start a tank with 100% dry limestone rock and sand (prewashed) and a gallon of lfs discard saltwater. Took about 12 weeks, but it got there.
We don't recommend that nowadays because of the risk of importing ich or some other problem. The point is simply---life takes off from just a little bit of live water, or rock, or whatever. What you miss by that route is the myriad of beneficial hitchhikers that come in on some rocks. But the curing process also does in many of those. The best rock is a 'seeding' rock from a tank you really, really trust...but that CAN go amiss.