Minerals — Siderite

Siderite is a type of mineral that belongs to the carbonate mineral group. Its chemical formula is FeCO3, which means it contains iron, carbon, and oxygen. Siderite can be found in a range of different locations around the world, including in sedimentary rocks, hydrothermal veins, and metamorphic rocks. It typically forms as a secondary mineral, meaning it develops after other minerals have already formed.One interesting property of siderite is its crystal structure. It has a rhombohedral crystal system, which gives it a distinctive shape that resembles a parallelogram with slightly rounded edges. It also exhibits a unique twinning pattern where...