Question

every day uses of rocks -pyrolusite​

Answer 1

Answer:

Rock is used in all every day life suck example for uses of some rock are : 1- Dolomite : it used as building stone and used in Glasses industry . 2- Sand : used in glasses industry , building raw materials , concretion , cement ,fiber glasses , coating , polar system . 3- feldspare : used in ceramic industry

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Answer 2

Answer:

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Explanation:

Manganese is an element that we rarely, if ever, see in its metallic state, but that nevertheless plays a big part of our everyday lives. Manganese is present in everything from alloyed steels and aluminum beverage cans to clear glass, colored brick, and dry-cell batteries.

Elemental manganese and iron both have steel-gray colors and similar atomic weights. Manganese is much harder, however, and so brittle that it cannot be machined. It ranks 12th among the elements in crustal abundance. Because of its great affinity for oxygen, it does not occur on Earth in elemental form, but is sometimes found as a native metal in meteors.

The most abundant manganese-bearing mineral is pyrolusite, or manganese dioxide (MnO2). Pyrolusite was used as a pigment in the black paints that Neolithic artists used to create Europe’s 17,000-year-old cave paintings. The exceptional hardness of the iron weapons of the ancient Greeks was due to the accidental incorporation of manganese into molten iron. The Romans later utilized pyrolusite in glass making, adding small quantities to decolorize glass and larger quantities to impart dark colors.

The name “pyrolusite” stems from the Greek words pyr (fire) and lousis (washing), and alludes to the mineral’s ability to remove color from molten glass.

By the mid-1700s, scientists began to suspect that pyrolusite contained a previously undiscovered element. In 1774, Swedish chemists Carl Scheele and Johann Gottlieb Gahn heated powdered pyrolusite with carbon to chemically reduce the compound and isolate a new metal that they named “manganese” (the Italian word for pyrolusite).

In the 1880s, metallurgists alloyed manganese with iron to create the first high-quality, modern steels. The earlier carbon steels, while hard, were too brittle for many applications; manganese steels were much harder and far less brittle.