For example, sandstone becomes quartzite, and limestone is transformed into marble. Arizona flagstone is a sedimentary sandstone used widely in the Southwest because it does not heat up like more ...

If you're planning on paving your driveway but aren't sure what material to choose for your pavers, here are some great (and not so great) options.

Florman said kyrock was the first paving material used at the Indianapolis Speedway. “The kyrock deposit … has a reserve estimate of over 300 million tons.