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The vivianite is intimately associated with pyrite and occurs as very thin tabular crystals, up to 10 cm in length. [10] Kosovo. Trepča Mines, Stari Trg. Thick prismatic crystals up to 10 cm long and 2 cm thick, relatively stable. Deep green in color and transparent, commonly resting on pyrrhotite or pyrite, and in some cases on quartz or ...