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siderite




siderite
A brown, gray-green, or white mineral, iron (II) carbonate (FeCO3), found in sedimentary iron ores and as vein deposits with other ores. Its crystals are rhombohedral in the hexagonal system and it occurs as massive deposits or in granular form. Hardness 4, relative density 3.8. Iron meteorites are sometimes known as siderites.


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   • GEOLOGY AND PLANETARY SCIENCE