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Boulangerite, Quartz


Boulangerite : Pb5Sb4S11, Quartz : SiO2

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Locality: Silver tunnel, Van Silver Mine, Van Silver Property, Brandywine Creek, Vancouver Mining Division, British Columbia, Canada
Boulangerite tube 0.1 mm long on Quartz. Note the red bar in the hollow of the tube. Cause??? Are there gaps between the rings that comprise the tube and permit a diffraction of the incident light (reflecting along tube) with the red bar diffracted the least? Ty Balacko specimen and photo.

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