This stone is granite and I wonder about its working in the days before powered machinery. How many hours labour did one of those curved stones represent? Or the stones with dressed surfaces in churches? And what tools were tough enough to shape granite? Was iron harder than granite and able to split it, chip it or grind it?
I know nothing about this and will look for a book that tells it all. It’s one aspect of that huge deficiency in all our educations in Britain: there’s no subject about the made world, how humanity has got from piling loose stones and using what lay around to mining, smelting, forging, baking: pottery, metallurgy, chemical technologies with ceramic and metal, etc etc. We get physics and chemistry if we’re lucky but not technology (in its basic sense of how materials are worked to make things).