Siderite, Ilvaite

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This is a rare pseudomorph specimen from Dal'negorsk. What you have is a cluster of huge, sharp ilvaites that have been completely (it appears) replaced by tan-colored siderite. There are two main clusters of tightly-intergrown crystals. Their faces and terminations are sharply preserved. The fractures you see are natural, having occurred probably due to dessication in the pocket.