The siderite (or siderite ) of empirical formula FeCO3 is a Carbonate of Fer (II) crystallizing in the crystalline Système trigonal with network rhomboedric, Groupe of space , structure Calcite.
Seldom pure, siderite often contains Magnésium and Manganèse and forms a complete solid solution with the Magnésite and the Rhodochroisite. On the other hand, substitution Calcium by Fer is limited because of the difference of the ionic rays.
Commune in the sedimentary rocks, the hydrothermal veins, associated with several lodging S metal (Ag, Fe, Cu, Pb).
Siderite is very present inside the grounds (sediments lake, estuaries, sources rich in carbonates) and extends to the deep basements (rocks, minerals and sediments). It was also identified in extraterrestrial materials (Météorite S, interplanetary dust).
It can be formed by organic way or inorganic way.
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