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Specimen # BOL711B81
It's not completely unstable like decomposing Limonite and it provides a much more appealing contrast than ordinary Pyrite
Specimen # BOL711B92
sharpness and translucency/gemminess sitting on wonderfully contrasting
Ferberite amber Specimen # BOL711B81A classic V shaped twin (twinned along the {100} face) of Ferberite from the famous Tasna mine in far southern Bolivia. This locality has produced what must be the finest twinned Ferberite crystals extant. Ferberite, as a species, is not known in well crystallized examples worldwide, and the twins from Tasna are a favorite among collectors. This twin is a great example of the material as it shows a fairly open twin, with aesthetic form. Along with the
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