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Siderite THOMAS FURTADO
What is it? Named by Wilhelm Karl von Haidinger in 1845 Its chemical formula is Fe. CO 3 It is called Iron (II) carbonate, and part of the Spathic iron ores Relatively low temp mineral Siderite is a brownish yellow mineral Siderite grown on top of a Quartz crystal, and a mix of Arsenopyrite
Physical Properties Luster: vitreous, silky, and or pearly Hardness: 3. 5 to 4. 5 (per Mohs hardness scale) Streak: White Cleavage plane: Perfect Luminescence: non-fluorescent Top left image- Siderite mixed with quartz crystals Top right image- Siderite mixed with a red iron oxide Bottom left image- Siderite mixed with Galena (metallic hexagons)
Physical Properties (Continued) Ø Solubility in HCl: Only effervesces in hot HCl Ø Habit: Massive and Tabular Ø Aggregation: Commonly granular, can be compact and botryoidal Ø Density/ Specific Gravity: 3. 96 g/cm^3 Botryoidal Siderite
Crystallography and Optical information Crystallography: Crystal system: Hexagonal Crystal class: Rhombohedral, Hexagonal, and Scalenohedral Optical information: Uniaxial optical axis 2 indices of refraction It has a lower birefringence and only completes up to 2 nd order red
This is a polarized image of a siderite sample combined with lumps of Glauconite.
Locations (cont. ) It can sometimes be found in igneous pegmatites Hydrothermal veins commonly contain siderite crystals Constituent of banded Precambrian iron formations
Other facts Distinguishing features: Has a brownish yellow color, higher specific gravity, and is soluble in hot HCl Uses: Mixed as an iron ore mineral in some countries and can be used as a brown pigment It can commonly be altered to iron oxides (hematite) or to hydroxides (goethite) This Photo by Unknown Author is licensed under CC BY-SA
References Barthelmy, D. (n. d. ). Retrieved from http: //webmineral. com/data/Siderite. shtml#. Xbhl 1 -h. Kh. Pb. Frederichs, T. , Dobeneck, T. V. , Bleil, U. , & Dekkers, M. (2003). Towards the identification of siderite, rhodochrosite, and vivianite in sediments by their low-temperature magnetic properties. Physics and Chemistry of the Earth, Parts A/B/C, 28(16 -19), 669– 679. doi: 10. 1016/s 1474 -7065(03)00121 -9 Klein, C. , & Philpotts, A. R. (2017). Earth materials: introduction to mineralogy and petrology. Cambridge: Cambridge University Press. Rollion-Bard, C. , & Marin-Carbonne, J. (2011, January 18). Determination of SIMS matrix effects on oxygen isotopic compositions in carbonates. Retrieved from https: //pubs. rsc. org/en/content/articlelanding/2011/ja/c 0 ja 00213 e/unauth#!div. Abstract. Siderite. (n. d. ). Retrieved from https: //www. mindat. org/min-3647. html. Siderite. (n. d. ). Retrieved from https: //www. sandatlas. org/siderite/. Siderite: The mineral Siderite information and pictures. (n. d. ). Retrieved from https: //www. minerals. net/mineral/siderite. aspx. Waldmann, S. , & Rütters, H. (2016). Geochemical effects of SO 2 during CO 2 storage in deep saline reservoir sandstones of Permian age (Rotliegend) – A modeling approach. International Journal of Greenhouse Gas Control, 46, 116– 135. doi: 10. 1016/j. ijggc. 2016. 01. 005 Zincian Siderite. (n. d. ). Retrieved from https: //www. crystalclassics. co. uk/product/zincian-siderite/.