Hubnerite, Quartz

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This is a fine specimen of Hubnerite from one of the most famous classic Bolivian localities. There are several sharp, lustrous, stubby, black crystals (a very slight red color will appear on the surface of the crystals with strong lighting) of Hubnerite beautifully oriented and intergrown with gem/gemmy Quartz crystals on matrix. These specimens are not common from Siglo Veinte, and this piece is one of the better specimens of the material that I have handled. It is confirmed Hubnerite, not Ferberite. The largest crystal measures 1.5 cm long.