UNESCO has declared this year as a "International Year of Crystallography". UNESCO names every year according to certain theme. So focus will be on that particular theme for that year. Usually scientific and environment related themes are selected. Crystallography plays key role in medicine, atomic structure etc.
To commemorate 2014, Swiss Post had issued two stamps on Crystallography on 6th March, 2014. To make it more special, these stamps are printed in Hot foil printing process. In Hot foil printing heat is used to transfer metallic foil to a solid surface. Here silver foil is used to make the crystal design and the names of the crystals.
The 85 centime stamp has the picture of Epidote, a green colored mineral which is abundant in Switzerland and the 1 franc stamp has the picture of Amethyst, a quartz variety found almost everywhere.
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