Siderite THOMAS FURTADO What is it Named by

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Siderite THOMAS FURTADO

Siderite THOMAS FURTADO

What is it? Named by Wilhelm Karl von Haidinger in 1845 Its chemical formula

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

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:

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

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.

This is a polarized image of a siderite sample combined with lumps of Glauconite.

Locations

Locations

Locations (cont. ) It can sometimes be found in igneous pegmatites Hydrothermal veins commonly

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

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

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/.