As has already been illustrated, the “scistostià” Slate, that is, the parallel weaving of the crystals that compose it, makes it possible sfaldarla, precisely, along parallel planes. It sounds simple; but derive from the rock thin and flat sheets, splitting it in the sense of layering, it is no mean feat. The machines are so far unable to fulfill it: and it is one of the cases in which the man, so often supplanted by mechanical devices, it takes its revenge. The job of the “spacchin” is not extinct, unlike so many others continue exactly as so many centuries ago, indispensable today as then. To do so, it is clear, must be highly experienced and dexterity; according to the experts is also required a special sensitivity that few possess.

Not hard to believe, given the results: who gets the rock, cutting the net, slabs that often have a few millimeters thick, using simple tools and relying solely on his eye and on his hand, he can not rely on the some feeling that nature has bestowed. A bit like the good pianist (the comparison does not seem risky), which is distinguished by any pianist because of the sensitivity that makes him find the touch to make the refinements necessary to make the most of interpreted music.