Quicklime is obtained by burning Limestone in a quicklime kiln with Charcoal. Only a Mason can use the quicklime kiln.
Quicklime can also be produced by burning shells obtained from silica pearls in the quicklime kiln. There is a 1:1 correspondence between limestone and shells when it comes to obtaining quicklime by burning or limestone powder by grinding. The latter is done solely by the Farmer profession and is used in making high quality fertilizer.