On June 7, 2017, the Austrian Mint will release "Mikrokosmos" (Microcosm), the newest in its extremely popular Silver Niobium series. Inaugurated in 2003, the bimetallic €25 coins haveconsistently sold out at the mint, and all-especially the first few issues-have gained value on the secondary market.

Each year's issue is composed of a disc of niobium surrounded by a .900 silver outer ring. The brilliant colors of the disc are achieved by anodic oxidation-a precisely controlled electrochemicalprocess that deposits a fine layer of oxidized niobium on the surface of the disc. The color is determined by the thickness of the layer. From 2003 through 2013, each year's design was processed witha single color; beginning in 2014, the finely detailed images began to be two-toned, with selectively colored elements set off against a solid background of a complementary color.

Niobium was chosen for the core due to its workability as a coinage metal and its low reactivity (which prevents its corroding where it comes in contact with the silver ring). Niobium's largerapplication is in the aerospace industry, making it a thematic fit with the series, whose designs have focused on achievements in science and engineering.

Where the 2014-2016 designs explored such enormous concepts as evolution, the cosmos, and time, the 2017 coin goes in the opposite direction-to the microcosmos. As described by the mint, the meansof transport for this journey is a butterfly, which is depicted on the obverse in a raspberry-colored relief design against a grass-green field. The background pattern is suggestive of cells seenunder a microscope. An atomic diagram appears above the butterfly; the date, 2017, appears below; and a molecular chain branches off to the butterfly's left. The silver ring bears the wordsREPUBLIK OSTERREICH and the denomination, 25 EURO. Other segments of the obverse ring show a close-up of a wing's tip, a closer view of the "feathers" that cover the wing, andsuccessively closer views of the cellular structures.

The reverse continues the micro-exploration begun on the obverse, but here, the subject is a bee. It appears in front of a ruler that measures its length in centimeters, amid a raspberry-coloredweb that suggests tissue cells. Another molecular diagram and a large grain of pollen are included, along with what appears to be a cross-section of a honeycomb. The outer ring contains the wordMIKROKOSMOS, along with designs indicating the analysis of pollen, bees' eggs, larvae, and other infinitesimally small bits of the world.

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Austria: Latest coin in popular Silver Niobium series rolls out in June(http://news.coinupdate.com/austria-latest-coin-in-popular-silver-niobium-series-rolls-out-in-june/)