i live in this really ridiculously geologically interesting part of the country where i am at the foot hills of a 14000 ft peak (live at 7000 ft though), it was formed by volcanic activity and has an extreme amount of quartz crystal(its pretty much a huge lightning antennae)
there is a town(used to be an alpine delta) at the base of this mountain where three streams collide. one is glacial runoff(where i harvest drinking water) and two run down from the other side of the mountain 100s of miles away. along these two rivers (now creeks due to damming/highway construction) are natural mineral springs (at least 15 known popular ones in town, within a mile of each other) so the ground there is porous and full of minerals and quartz! there are also a ton of caves which i regularly explore
we found a cave that has this vein of wonderful white creamy clay that i have been harvesting and eating. it tastes like pure calcium, like what i remember a creamy thick milk/butter would taste like (sans fart aftertaste of milk) when i eat the white clay, i have eaten it on an empty stomach and completed insane bicycling to hiking journeys carrying a lot of weight. when i eat calcium Benoite clay i do not feel the same.
there is also a place that has huge red rocks jolted from the earth and they tower like cathedrals, the rocks are very sandy though so after a ran there is a silty/fine run off of brilliant red mud, i harvest this and spread it on my body, it has cleared rashes! when i do this i CANNOT SLEEP!, i have too much energy and feel invincible, also super smooth skin, it is beautiful bronze color with flecks of iron pyrite(fools gold) it kind of sinks in to the skin and stains it(as well as clothing) i think its iron
does any one else eat/use clay that is harvested locally? if you can find a source that you believe is safe i would suggest it! there is also a chemical in clay that makes i clay and not mud, that gives it plasticity, i wonder if this has any benefit?
this area was home to a lot of native Americans and many of the locations where places to heal so there is definitely that presence, i know they were doing the same