DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Siderite, an iron carbonate (FeCO3), a mineral that forms a series with the closely related rhodochrosite and magnesite. Its crystal system is trigonal-hexagonal, most commonly tabular crystals. Here it is in a cryolite matrix. From Ivittuut in West Greenland. Width 90mm.
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