Croatia will Issue Stamps on Minerals

croatia-minerals-stampsBy Wolfgang Beyer

Vice Chairman of the German Philatelic Collector Group ArGe Zoologie

Croatia will issue a set of two stamps on Rhyolite and Sea Salt on 24th October 2016. Rhyolite is a sour effusive rock of grey to green colour built mostly from the minerals quartz, feldspar, mica and amphibole. It is of porphyric structure with holo crystal granular base.Sea Salt . mineral is extremely important because the sodium ions are indispensable for normal functioning of many physiologic processes in human organism.

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