Siderite

Siderite is a mineral composed of iron(II) carbonate (FeCO 3 ). Its name comes from the Ancient Greek word ( ), meaning "iron". A valuable iron ore, it consists of 48% iron and lacks sulfur and phosphorus. Zinc, magnesium, and manganese commonly substitute for the iron, resulting in the siderite-smithsonite, siderite-magnesite, and siderite-rhodochrosite solid solution series. Siderite has Mohs hardness of 3.75 to 4.25, a specific gravity of 3.96, a white streak and a vitreous or pearly luster. Siderite is antiferromagnetic below its Néel temperature of that can assist in its identification. It crystallizes in the trigonal crystal system; crystals are rhombohedral in shape, typically with curved and striated faces. It also occurs in masses. Color ranges from yellow to dark brown or black, the latter being due to the presence of manganese. Siderite is commonly found in hydrothermal veins, and is associated with barite, fluorite, galena, and others. It is also a common diagenetic mineral in shales and sandstones, where it sometimes forms concretions, which can encase three-dimensionally preserved fossils. In sedimentary rocks, siderite commonly forms at shallow burial depths and its elemental composition is often related to the depositional environment of the enclosing sediments.…

Siderite is a mineral composed of iron(II) carbonate (FeCO 3 ). Its name comes from the Ancient Greek word ( ), meaning "iron". A valuable iron ore, it consists of 48% iron and lacks sulfur and phosphorus. Zinc, magnesium, and manganese commonly substitute for the iron, resulting in the siderite-smithsonite, siderite-magnesite, and siderite-rhodochrosite solid solution series. Siderite has Mohs hardness of 3.75 to 4.25, a specific gravity of 3.96, a white streak and a vitreous or pearly luster. Siderite is antiferromagnetic below its Néel temperature of that can assist in its identification. It crystallizes in the trigonal crystal system; crystals are rhombohedral in shape, typically with curved and striated faces. It also occurs in masses. Color ranges from yellow to dark brown or black, the latter being due to the presence of manganese. Siderite is commonly found in hydrothermal veins, and is associated with barite, fluorite, galena, and others. It is also a common diagenetic mineral in shales and sandstones, where it sometimes forms concretions, which can encase three-dimensionally preserved fossils. In sedimentary rocks, siderite commonly forms at shallow burial depths and its elemental composition is often related to the depositional environment of the enclosing sediments. In addition, a number of recent studies have used the oxygen isotopic composition of sphaerosiderite (a type associated with soils) as a proxy for the isotopic composition of meteoric water shortly after deposition. Evidence of the presence of siderite on Mars is being interpreted as a possible indicator of the presence of abundant water early in the climate history of that planet. Siderite late 1800s Redruth.jpg|Siderite from Redruth, Cornwall, England Galena-Quartz-Siderite-oldeuro-56c.jpg|Siderite crystals with galena and quartz. Size: Chalcopyrite-Siderite-gha7a.jpg|Disc-shaped, brown siderite crystals perched upon chalcopyrites SideriteTaillée.jpg|Cut siderite from Minas Gerais, Brazil. Size: Siderite-64328.jpg|Colorado siderite, with sharp blades of olive-brown and minor accenting quartz Siderite Concretion Carboniferous.JPG|Fossiliferous siderite concretion from the Lower Carboniferous

Text derived from https://en.wikipedia.org/w/index.php?oldid=1371456304 under CC BY-SA 4.0; modifications have been made.