Fluorite (twinned) on Calcite on Galena
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Don’t go right by this one, as it may be a bit plain in natural light but hooboy! on the longwave! Capturing what is revealed is very tricky with the camera, as the orange from the calcites (I assume slightly manganoan) flares but is not picked up by the naked eye. The largest crystal is 1.9cm. The fluorescence is a bright blue/white and each crystal has multiple generational phantoms. This piece was in the Bill and Carol Smith collection and then in the Martin Zinn collection. There is a reason!
Locality: Weardale, Durham, England
Composition: calcium fluoride and silicon dioxide