Marshite With Cuprite

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Marshite almost never turns up for sale, with most specimens either lost to the ages or already in museums. This is a very rich specimen, obviously validated, which I exchanged from the South Australian Museum last year. This piece features hundreds of sub-mm but eye-visible marshite crystals, on gangue matrix with small cuprite crystals. A very rich reference specimen for this important and very RARE copper species (it is a startlingly simple copper iodide, CuI). When found, the mineral shows a pink coloration that faded naturally to colorless or beige over time (and now, is stable). (TYPE LOCALITY)