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Description:Posnjakite is a lesser known Copper Sulfate and is among the classic Slovakian copper minerals, and some of the most well known specimens are from Richtarova in Slovakia. This piece is a beautiful representative specimen of Posnjakite hosting beautiful blue colored groups associated with minor blue-green Langite, soft green Malachite and rich green Devilline on matrix. These specimens are very difficult to impossible to obtain on the market these days, and are sought after by European collectors. Enjoy.