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Description:The famous mines at Chanarcillo, Chile produced a rich array of beautiful silver-related species. This aesthetic "feather" of elongated, spinel-twinned silver crystals is a classic Chanarcillo habit. Tiny acanthite crystals richly pepper the feather and the pod of attached matrix are striking accents. Undoubtably century-old material, but no proof. Ex Dr. Joan Massague Collection. Valued at $900-1200.