Siderite on Arsenopyrite (ex Brian Kosnar Collection)

Item Description

I've only had a few of these to offer over the years, and they all came out around 15-20 years ago I'm told. This piece is a very hard to find specimen of this highly desirable and famous material featuring beige colored "rosettes" of Siderite which are sitting atop a silvery matrix of Arsenopyrite. It's the ONLY piece I've seen from this locality that features Siderite ON Arsenopyrite. If you're a Bolivian mineral collector, or if you collect carbonates, do not miss out on this beautiful display specimen of this well-known but very scarce material. From Brian Kosnar's personal collection.