bluestone

This consists of thoroughly spraying the plants with Bordeaux mixture once in ten days or two weeks after they have begun to run. Bordeaux mixture is made by bringing together the milk of lime and a solution of copper sulphate (bluestone).

This belt is about 1,000 feet wide at the McConnell Mine, and ends a few hundred yards north of the Bluestone. […] It was worked about 30 years ago, and for a time supplied natural bluestone (chalcanthite) to the amalgamating mills ...

From Cyprus were brought bricks of lead, with bluestone and elephant's tusks, and the vases were carved in fanciful designs, with the heads of goats, lions, bulls, and eagles.