The heat and carbon in the charcoal separated oxygen from the pyrolusite, leaving a metallic manganese residue. ❋ Unknown (2007)
The most important mineral is pyrolusite, because it is the main ore mineral for manganese. ❋ Unknown (2007)
In 1774, while heating the mineral pyrolusite (MnO2, manganese dioxide) in a charcoal fire, the Swedish scientist Johann Gahn discovered manganese. ❋ Unknown (2007)
Traces of pyrolusite in a chunk of raw glass, the result of a failure to produce colorless glass at Sagalassos ❋ Unknown (2003)
One special find this week was a chunk of raw glass, showing an unhomogeneous color, probably as a result of an insufficient or failed addition of decolorant in a reduced furnace atmosphere (e.g. manganese in the form of the mineral pyrolusite). ❋ Unknown (2003)
~ Manganese is found in nature chiefly as the dioxide MnO_ {2}, called pyrolusite. ❋ William McPherson (N/A)
_ In the laboratory chlorine is made by warming the mineral pyrolusite (manganese dioxide, MnO_ {2}) with concentrated hydrochloric acid. ❋ William McPherson (N/A)
The periodic process depends on the interaction between manganese dioxide (pyrolusite), sulphuric acid, and a bromide, and the operation is carried out in sandstone stills heated to 60° ❋ Various (N/A)
The substitution of potassium chlorate for pyrolusite is recommended when calcium chloride is present in the bittern. ❋ Various (N/A)
Their method consisted of reducing the pure pyrolusite in large plumbago crucibles, in the presence of carbon and an extra basic flux; the operation was carried on in a strong coke fire, and at the end of about six hours the _crude manganese_ is poured out, having the following composition: ❋ Various (N/A)
~ While studying the action of hydrochloric acid upon the mineral pyrolusite, in 1774, Scheele obtained a yellowish, gaseous substance to which he gave a name in keeping with the phlogiston theory then current. ❋ William McPherson (N/A)
The same pyrolusite (binoxide of manganese) cylinder used with the same thin rod of zinc will precipitate 75 per cent. more copper from solution in an hour when caustic potash is used than when sal ammoniac is employed. ❋ Various (N/A)
The binoxide, or peroxide, is the black manganese of commerce, and the pyrolusite of mineralogists, and is by far the most abundant of the manganese ores. ❋ Various (N/A)
How does pyrolusite effect the decolorizing of glass containing iron? ❋ William McPherson (N/A)
Like iron ores, manganese ores consist principally of the oxides of manganese (pyrolusite, psilomelane, manganite, wad, and others), and rarely the carbonate of manganese (rhodochrosite). ❋ Unknown (1915)
Manganese occurs mainly as black oxide (MnO_ {2}) in the mineral pyrolusite; and, in a less pure form, in psilomelane and wad. ❋ Cornelius Beringer (1886)
The oxygen from the pyrolusite, leaving a metallic manganese residue. ❋ Unknown (2010)
Some famous chemists in Europe tried to analyze pyrolusite, but they were not successful. ❋ Unknown (2009)
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. ❋ Various (N/A)
For example, 0.7560 gram of pyrolusite and 1.000 gram of iron were taken and treated as above; 13.9 c.c. of "permanganate" (standard 100 c.c. = ❋ Cornelius Beringer (1886)
