Pyrolusite

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Pyrolusite

Pyrolusite is a mineral

Mineral

A mineral is a naturally occurring solid formed through Geology processes that has a characteristic chemical composition, a highly ordered atomic structure, and specific physical properties....
consisting essentially of manganese

Manganese

Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a Oxidation state in nature , and in many minerals....
dioxide (Mn

Manganese

Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a Oxidation state in nature , and in many minerals....
O

Oxygen

Oxygen no O2 produced; 2) O2 produced, but absorbed in oceans & seabed rock; 3) O2 starts to gas out of the oceans, but is absorbed by land surfaces and formation of ozone layer; 4-5) O2 sinks filled and the gas accumulates]]...
₂) and is important as an ore

Ore

An ore is a type of Rock that contains minerals such as gemstones and metals that can be extracted through mining and refined for use. Samples of ore in the form of exceptionally beautiful crystals, exotic layering visible when sectioned or polished or metallic presentations such as large nuggets or crystalline formations of metals suc...
of manganese. It is a soft, black, amorphous appearing mineral, often with a granular, fibrous or columnar structure, sometimes forming reniform crusts. It has a metallic luster

Lustre (mineralogy)

Lustre is a description of the way light interacts with the surface of a crystal, rock , or mineral. For example, a diamond is said to have an adamantine lustre and pyrite is said to have a metallic lustre....
, a black or bluish-black streak, and readily soils the fingers. The specific gravity

Specific gravity

Specific gravity is defined as the ratio of the density of a given solid or liquid substance to the density of water at a specific temperature and pressure, typically at 4?C and , making it a dimensionless quantity ....
is about 4.8.

Pyrolusite and rhodochrosite

Rhodochrosite

Rhodochrosite is a manganese carbonate mineral with chemical composition Manganese carbonate. In its pure form, it is typically a rose-red color, but impure specimens can be shades of pink to pale brown....
are among the most common manganese minerals.

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Encyclopedia

Pyrolusite is a mineral

Mineral

Manganese

Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a Oxidation state in nature , and in many minerals....
dioxide (Mn

Manganese

Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a Oxidation state in nature , and in many minerals....
O

Oxygen

Ore

Lustre (mineralogy)

Specific gravity

Rhodochrosite

Sodium

Sodium is an element which has the symbol Na , atomic number 11, atomic mass 23 amu , and a common oxidation number +1. Sodium is a soft, silvery white, highly reactive element and is a member of the alkali metals within "group 1" ....
, magnesium

Magnesium

Magnesium is a chemical element with the symbol Mg, atomic number 12, atomic weight 24.3050 and common oxidation number +2.Magnesium, an alkaline earth metal, is the ninth most abundance of the chemical elements in the universe by mass....
, aluminium

Aluminium

Aluminium or aluminum is a silvery white and ductile member of the boron group of chemical elements. It has the symbol Al; its atomic number is 13....
, or by electrolysis

Electrolysis

In chemistry and manufacturing, electrolysis is a method of separating Chemical bond chemical compound by passing an electric current through them....
. Pyrolusite is extensively used for the manufacture of spiegeleisen

Spiegeleisen

Spiegeleisen is a ferromanganese alloy containing approximately 15% manganese and small quantities of carbon and silicon. Historically, this was the standard form in which manganese was traded and used in steel making ; today, manganese is usually traded and used in more concentrated form, 80% manganese content being typical....
and ferromanganese

Ferromanganese

Ferromanganese, a ferroalloy with high content of manganese, is made by heating a mixture of the oxides manganese oxide and iron oxide, with carbon in a furnace....
and of various alloys such as manganese-bronze

Bronze

Bronze is a metal alloy consisting primarily of copper, usually with tin as the main additive, but sometimes with other chemical element such as phosphorus, manganese, aluminium, or silicon....
. As an oxidizing agent it is used in the preparation of chlorine

Chlorine

Chlorine...
and disinfectants (permanganate

Permanganate

A permanganate is the general name for a chemical compound containing the manganate ion, . Because manganese is in the +7 oxidation state, the manganate ion is a strong oxidizing agent....
s) and for decolorizing glass. When mixed with molten glass it oxidizes the ferrous iron

Iron

Iron is a chemical element with the symbol Fe and atomic number 26. Iron is a Group 8 element and period 4 element. Iron is lustrous and silvery in color....
to ferric iron, and so discharges the green and brown tints. As a coloring material, it is used in calico printing and dyeing; for imparting violet, amber

Amber (color)

Amber is an orange -yellow color that got its name from the material known as amber. Due to this, amber can refer not to one but to a series of shades of orange , since the natural material varies from nearly yellow when newer to orange or reddish-orange when older....
, and black colors to glass, pottery, and bricks; and in the manufacture of green and violet paints.

Pyrolusite

Variations in crystal habit