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Mn
Manganese


Atomic no.:
25
Atom. weight: 54.93805
Density: 7.44
Class:
Heavy metal
Melting point: 1244°C
Boiling point: 2032°C
Colour: silvery shiny
   
Discoverer: Johan Gottlieb Gahn
Place: Stockholm, Sweden
Year: 1744

Manganese was discovered in 1774 by J.G. Grahn in Stockholm, Sweden. Manganese is abundant in the earth's crust (950 ppm) and its principle ore is pyrolusite, a crude form of the dioxide. It is obtained by reduction with aluminum or in a blast furnace. Pure manganese is a hard, brittle, silvery colored, metallic element which exists in three polymorphic forms (alpha, beta and gamma) and has a complicated crystal structure. It resembles iron in being moderately reactive and dissolving in cold, dilute non-oxidising acids. When exposed to air, manganese forms an extremely stable oxide coating which is not easily reduced. Pure manganese is ferromagnetic after processing. Manganese is not used as the basis of alloys but it is a common constituent of alloys based on other systems, its addition resulting in a significant improvement in the physical and mechanical properties of the resulting alloys. For example, it is present in all steels and cast iron, the concentration being increased for special grades of material; it is also added to certain grades of brass and bronze as well as some nickel and aluminum base alloys. Manganese is also an important element for living beings as manganese deficiency can result in weakened bones and cause them to be easily broken. On average, a human body will contain 12 mg of the element.

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 Manganese - precision density-standard cube 1cm3  Art. Nr. 004609  
Manganese - precision density-standard cube 1cm3
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Manganese - precision density-standard cube 1cm3

The high effort and the high failure rate due to unfavourable properties of this metal define the price. Cubes of pure melted Manganese are very unique!

Using finest materials, each density cube was lapped to 10x10x10mm by a mechanical engineering company with an accuracy of 0.01 millimeter. Each one separately ground and mirror polished it represents the theoretical density of the respective element by its weight. The weight is not affected by the laser inscription. Information such as element symbol, name and density is durable burned at the surface. Each element even shows its specific characteristis in colour and reaction with the laser. Altogether 25 elements are planned in a complete set in a wooden case.

Lead time: ~ 2 weeks

Amount: 1 St. / 1 pc..
Purity : 99.9%
Packing: PE - bag
499.00 Euro
- tax free

Stock quantity: 5 available ***Lead time: ~ 2 weeks ***

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