Obverse. Photo © Austrian Mint
  • 25 Euro 2017, KM# 3272, Austria, Silver Niobium Coin, Microcosm
  • 25 Euro 2017, KM# 3272, Austria, Silver Niobium Coin, Microcosm
  • 25 Euro 2017, KM# 3272, Austria, Silver Niobium Coin, Microcosm, Box with a certificate of authenticity

Following the exploration of the cosmos in 2015, the latest edition in the Austrian Mint’s innovative and ingenious two-tone Silver Niobium series embarks on a technological journey in the opposite direction – to the microcosmos. For the past decade and a half these coins have been employing the combination of silver and niobium to explore fittingly fascinating themes ̶ the journey of scientific discovery featured on Microcosm is no exception.

The means of transport for this journey is a rather unexpected one ̶ the butterfly. A shining example is found in the raspberry-red and grass-green niobium centre of the coin’s obverse. But the journey of discovery really begins on the coin’s reverse, where a microscopic view of a butterfly wing is shown at the top of the centre. Moving clockwise we go even deeper with the help of an electron microscope. But that is not the end of the expedition: the bottom half of the coin shows a cell, its structure and even its core. What makes our 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. Microcosm, like all the other coins in the series, truly glistens with knowledge.

The coin contains 9 g of 900 Fine silver in its outer ring and 6.5 g of 998 pure niobium. Designed by Mag. Helmut Andexlinger and Herbert Wähner, the coins are boxed with a certificate of authenticity and enclosed in a slipcase.


Depicts the “raspberry-red” butterfly set against a “grass green” field on the niobium inner disc. The green field behind the butterfly is actually patterned much like the scales of a butterfly’s wing when viewed close-up. Also on the inner disc, above and between the butterfly’s antennae, is a depiction of an atomic model as conceived by Danish physicist Niels Bohr. The nucleus and three revolving electrons are colored the same red as the butterfly, while the orbits are a lighter green than the field. A molecular model crosses over from the left of the outer ring and is partially hidden by the butterfly’s left wing. The year 2017 is inscribed beneath the butterfly in a font resembling one that may be used on an older computer terminal.

The outer ring is divided into a number of uneven sectors and contains a larger variety of designs and textures. Starting on the left, the inscription “Republic of Austria” occupies and extends past the top left quadrant.

On the top of the coin, after the word “Österreich” is an image of a butterfly’s wing. Proceeding clockwise from this image moves the viewer’s eye through sections that represent progressively higher magnifications of the same object until finally, at the bottom of the obverse, individual cells. The biological machinery of an animal cell is portrayed on the outer silver ring beneath the date 2017.



The central disc shows a close-up of the surface of pollen. Within one of the cells is a realistic portrayal of a bee, its physiognomy accurate enough to confirm that it is a female. To the right of the bee is a 3D model of a chemical compound that resembles that of methane (CH4). Below the bee is a pollen grain. Behind the bee, however, are what look like the marks on a ruler, with numbers ranging from “1” to “2.5”.

Beginning in the upper left quadrant is a length of some form of measuring tool, perhaps a protractor since the units are marked off in degrees (by tens, from 10 to 80). To the left of the “protractor” is the inscription MIKROKOSMOS, surrounded by various solid and dotted lines.

Beneath the inscription MIKROKOSMOS is a partial hexagon with what appears to be a rhinovirus, or cold virus, inside. A number of small shapes that may be pollen or viruses are massed together in the lower right of the reverse alongside various chemical, viral and bacterial shapes. To the left of these shapes is a larger pollen particle, and above it is a four-stage depiction of the division of a cell into two daughter cells.

10° 20° 30° 40° 50° 60° 70° 80° MIKROKOSMOS
1 1,5 2 2,5

Type Commemorative Issue (Non-circulating)
Material Bi-Metallic
Ring Silver
Center Niobium
Weight 16.5 g
Diameter 34 mm
Thickness 2.55 mm
Shape round
Alignment Medal
Austrian Mint

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