Barium


It was a Bolognese shoemaker, V. Casciorolus, that noted, in 1602, the phosphorescence of the combustion products of an heavy spar. He called this stone solis-pencil, and this later would come to be called Stone of Bologna. It was thought at the time that this heavy spar was some kind of gypsum. In 1774, K. W. Scheele discovered that this mineral contained a new earth that originated an insoluble sulfate in water. G. of Morveau called it "barote", from the Greek "barys" (heavy), due to the high density of some of the compounds of this element. This name was later changed by Lavoisier being nowadays known as barite.