Cylindrite

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Cylindrite is the only mineral species, so far as I know, whose natural crystal habit is cylindrical! It is still found today at this locality, known for this most unusual sulfide species since the 1890s. However, most specimens have rather wimpy, thin crystals that at first glance look more acicular or like zinckenite than cylindrical in a startling manner, as we have here. These robust, thick, well-exposed crystals are really top of the game for the species. I have seen many examples, but few so well-developed as this, in terms of showing off the form so readily. (TYPE LOCALITY)