Austria - 25 Euro - 2017 - The Microcosm - Niobium


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Austria - 25 Euro
Year: 2017
Series Silver Niobium Coin Series
Theme: The Microcosm
Composition: Silver-Niobium 
Fineness: 0.900
Weight: 16.5000g
Quality: Special uncirculated FC
Diameter: 34mm
Mint Münze Österreich
Mintage: 65.000
Delivery In original box with certificate of authenticity

The German physicist Ernst Ruska demonstrated that a magnetic coil could act as an electron lens, and used several coils in a series to build the first electron microscope in 1933. The electron microscope with 12,000-fold magnification became an indispensable tool in physics, chemistry, biology and technology. The 25 Euro coin shows a raspberry-red butterfly on a grass-green niobium centre, framed by a molecular chain, an atomic symbol, and details of the butterfly. What makes the Silver Niobium coins so special is the fact that their niobium tones arise without the application of colour, purely through light refraction on an extremely thin, transparent oxide layer.