A mining company’s plans to destroy a Tuscan mountain crest to get at its prized marble has caused a furor. “The plan has pitted environmentalists against trade unions and local authorities, who argue the stone from Monte Altissimo in the Apuan Alps is needed to protect jobs. But the controversy also sets contemporary artists and designers against art historians who treasure the mountain, which served as one of Michelangelo’s most celebrated, if frustrating, quarries.”