interesting perspective - good luck and i guess thats something i took for granted.
we have a surplus where i live. MA field stone (granite) got in the way of early american agriculture so
you can see handmade rock fences everywhere from way back when they had to clear land for farming.
granite, quartz, etc. old homes (my friends from, 1782, sits on granite slab foundation
cant put shovel in ground without hitting a rock the size of a baseball at least
these are from the coastline i collected last week, you can see they are mostly granite and these are shaped by the ocean
i dont do ROR, but i use them to keep tippy pots in place from windy area of buzzards bay coast