Therefore, chlorite's structure appears as follows: That's why they are also called 2:1:1 minerals. Recognizing a mineral as a member of the chlorite group is usually easy. Various shades of green; rarely yellow, red, or white. When found, chlorite is usually intimately intermixed with other minerals, and the cost of separation would be high. The most common chlorite minerals are clinochlore, pennantite, and chamosite. Diagnostic Features: Characterized by its green color, micaceous habit and cleavage, and by the fact that the folia are not elastic. Very few industrial uses. Inexpensive mineral collections are available in the Geology.com Store. The chlorite ion adopts a bent molecular geometry, due to the effects of the lone pairs on the chlorine atom, with an O–Cl–O bond angle of 111° and Cl–O bond lengths of 156 pm. A chlorite (compound) is a compound that contains this group, with chlorine in the oxidation state of +3. [1] "Chlorite" is the name of a group of common sheet silicate minerals that form during the early stages of metamorphism. Unlike other 2:1 clay minerals, a chlorite's interlayer space (the space between each 2:1 sandwich filled by a cation) is composed of (Mg2+, Fe3+)(OH)6. The free acid, chlorous acid HClO2, is the least stable oxoacid of chlorine and has only been observed as an aqueous solution at low concentrations. As a result, the individual chlorite minerals are poorly known. Maderanertal, in Uri, Switzerland, is famous for its shiny green Chlorite coatings on Quartz and Adularia. (Mg,Fe)3(OH)6. Chlorite group includes hydrated magnesium and iron hydrosilicates which make mixed crystals of complex chemistry, whose general formula is given in Table 2.11. A more comprehensive list of chlorite minerals and their chemical compositions is shown in the green table on this page. Talc is much softer and feels soapy between fingers. Chlorite minerals have a generalized chemical composition of (X,Y)4-6(Si,Al)4O10(OH,O)8. Most chlorite minerals are green in color, have a foliated appearance, perfect cleavage, and an oily to soapy feel. Within ultramafic rocks, metamorphism can also produce predominantly clinochlore chlorite in association with talc. They are also found as retrograde minerals in igneous and metamorphic rocks that have been weathered. Chlorite is a common mineral associated with hydrothermal ore deposits and commonly occurs with epidote, sericite, adularia and sulfide minerals. Its major use is as a coincidental constituient in crushed stone. The name "chlorite" is often used in classrooms and the field because the minerals are difficult or impossible to identify. Sodium chlorite is derived indirectly from sodium chlorate, NaClO3. Heavy metal chlorites (Ag+, Hg+, Tl+, Pb2+, and also Cu2+ and NH+4) are unstable and decompose explosively with heat or shock.[1]. First, the explosively unstable gas chlorine dioxide, ClO2 is produced by reducing sodium chlorate with a suitable reducing agent such as methanol, hydrogen peroxide, hydrochloric acid or sulfur dioxide. Chlorite minerals are found in rocks altered during deep burial, plate collisions, hydrothermal activity, or contact metamorphism. These chlorite minerals are often found in fractures, solution cavities, or the vesicles of igneous rocks. It occurs in the Korshunovskoye iron skarn deposit in the Irkutsk Oblast of Eastern Siberia.[3]. These minerals are all apart of the Chlorite Group of minerals. Chlorite is also a common metamorphic mineral, usually indicative of low-grade metamorphism. The best way to learn about minerals is to study with a collection of small specimens that you can handle, examine, and observe their properties. Another environment of chlorite mineral formation is in oceanic crust descending into subduction zones. Rocks that commonly contain abundant chlorite include greenschist, phyllite, chlorite schist, and greenstone. This specimen is approximately 3 inches (7.6 centimeters) across. Chlorite minerals have a generalized chemical composition of (X,Y)4-6(Si,Al)4O10(OH,O)8. Mg5Al2- Si3Oio(OH)8 is the formula for clinochlore. The composition and physical properties of chlorites vary as these ions substitute for one another in solid solution. This formula emphasizes the structure of the group. Composition: Hydrous iron-magnesium aluminum silicate. [1] Chlorite is found in large boulders scattered on the ground surface on Ring Mountain in Marin County, California. Used as a filler and as a constituent of clay. The terms are seldom used and the ortho prefix is somewhat misleading as the chlorite crystal system is monoclinic and not orthorhombic. This makes them difficult to differentiate in hand specimen. The powder generated by scratching is white. Chlorite is a mineral with a low potential for industrial use. Except where otherwise noted, data are given for materials in their, https://en.wikipedia.org/w/index.php?title=Chlorite&oldid=964481812, Pages using collapsible list with both background and text-align in titlestyle, Articles containing unverified chemical infoboxes, Creative Commons Attribution-ShareAlike License, This page was last edited on 25 June 2020, at 19:12. In this environment chlorite may be a retrograde metamorphic alteration mineral of existing ferromagnesian minerals, or it may be present as a metasomatism product via addition of Fe, Mg, or other compounds into the rock mass. Chlorite minerals most often form in rock environments where minerals are altered by heat, pressure, and chemical activity. This (Mg2+, Fe3+)(OH)6 unit is more commonly referred to as the brucite-like layer, due to its closer resemblance to the mineral brucite (Mg(OH)2). This formula emphasizes the structure of the group. The alkali metal and alkaline earth metal compounds are all colorless or pale yellow, with sodium chlorite (NaClO2) being the only commercially important chlorite. They are found in igneous, metamorphic and sedimentary rocks. The chlorite ion, or chlorine dioxide anion, is the halite with the chemical formula of ClO−2.

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