Zinkenite, Kaolinite

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Diverging sprays of lustrous, flattened, black zinkenite crystals richly cover the sculptural, platy, kaolinite matrix on this fine, rare, old-time specimen from the Itos Mine at Ouro City, Bolivia. This classic, seldom-seen combination specimen was collected by Sam Gordon on one of his several trips to Bolivia, Peru and Chile in the 1920s and 1930s for the Philadelphia Academy of Sciences. Confirmed by analysis, on my end, via Bart Cannon's lab.