What Factors Determine the Quality of Construction Rock?
Pick the wrong aggregate, and you will know about it eventually, usually at the worst possible time. A foundation that settles unevenly, a road base that softens after rain, and concrete that does not reach the strength it was supposed to. These are not random problems. They trace back to material quality, and material quality traces back to the rock itself.

https://www.westernmaterials.n....et/blog/what-factors