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Classic Katanga Copper Crescent specimen from the L'Etoile du Congo Mine, D. R. Congo. A thick bright blue botryoidal deposit of Chrysocolla has over grown a cellular grey-black Mn-oxide with shards of tan coloured rock. The Chrysocolla has in turn been mostly covered in a layer of crystallized sparkling green Malachite. A fine example of Malachite on Chrysocolla from the mine.