When talking about rocks, i.e. an aggregate of minerals, which type would be the "healthiest"
I'm not talking about some voodoo crystal-healing stuff here, just if there is any rock formation that has a relatively high number and proportion of minerals that the body needs e.g. magnesium, potassium, zinc etc that would leach into water (like mineral water) for example if you live in an area where that rock is prevalent where the community takes their groundwater
At the same time as having a relatively low number of minerals that the body does not need (or that would eventually also be harmful at high quantities) e.g. silica, uranium, talcum etc