Pyrolusite Definition

Pyrolusite Sentence Examples

• Manganous Sulphate, MnSO 4, is prepared by strongly heating a paste of pyrolusite and concentrated sulphuric acid until acid fumes cease to be evolved.

• The valuation of pyrolusite is generally carried out by means of a distillation with hydrochloric acid, the liberated chlorine passing through a solution of potassium iodide, and the amount of iodine liberated being ascertained by means of a standard solution of sodium thiosulphate.

• Scheele, in examining a specimen of pyrolusite, found a new substance to be present in the mineral, for on treatment with sulphuric acid it gave an insoluble salt which was afterwards shown to be identical with that contained in heavy spar.

• The substitution of potassium chlorate for pyrolusite is recommended when calcium chloride is present in the bittern.

• Scheele, the discoverer of chlorine, in 177 4, is the peroxide of manganese (manganese dioxide), found in considerable quantities in nature as " manganese ore " (the purest of which is called pyrolusite), and also artificially regenerated from the waste liquors of a former operation.