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dark blue colored Vivianite crystal
slightly "curved"
Specimen # BOL711B135
and take my word for it
Ferberite Phosphophyllite dark blue colored Vivianite crystalAn impressive and attractive twinned Ferberite from Tasna. This species was sometimes previously referred to as "Wolframite", which was supposed to be an intermediary species between Ferberite and Hubnerite, but has since been discredited. This splendid piece is a sharp, highly lustrous, jet black twinned crystal of Ferberite (twinned along the a{100} face). For a final aesthetic touch, one can see a sparkling spherical aggregate of Marcasite on the
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