text: A limepit is either a place where limestone is quarried, or a man-made pit used to burn lime stones in the same way that modern-day kilns and furnaces constructed of brick are now used above ground for the calcination of limestone (calcium carbonate, CaCO) and by which quicklime (calcium oxide, CaO) is produced, an essential component in waterproofing and in wall plastering (plaster skim).