[Chemical Composition] Chlorite is a group of minerals with fairly complex chemical composition. It includes a wide variety of types, which can be simply divided into two subfamilies:
(1) The chlorite subfamily: It is a chlorite rich in magnesium , which is a common chlorite. It mainly includes chlorite and chlorite. Its chemical formula is as follows: (Mg, Fe 2+ ) 8 - P (Al, Fe 3+ ) 2P Si 4 - P O 10 (OH) 8
(2) Scale green chlorite subfamily: It is a chlorite that is rich in iron and is mostly colloidal. It is mainly chlorite and chlorite, and its chemical formula is as follows: (Fe 2+ ,,Mg) np (Fe 3+ ,Al) 2P O 10 (OH) 2(n-2) · X H2O
[Form] Monoclinic system. The crystal has a pseudo hexagonal plate shape and a sheet shape. It is often a scaly aggregate. Iron-rich chlorite is often a scorpion-like aggregate with a concentric structure, as well as sandstone cement or cryptocrystalline dense block and soil.
[Physical properties] The chlorite family minerals are generally green to varying degrees. The glass is shiny and the cleavage surface is pearl luster. Hardness 2-2.5. Flexible. {001}The cleavage is extremely complete. The proportion is 2.6-2.85. It has a slippery feel.
[genesis and occurrence] The minerals of this family are widely distributed. Magnesium-rich chlorite is chlorite, which is mainly produced in metamorphic rocks (such as green mud schist) and various medium-low temperature hydrothermal alteration rocks. The iron-magnesium minerals in magmatic rocks are most easily converted into chlorite by the action of hydrothermal fluid. Iron-rich chlorite (mainly chlorite) is mainly produced in sedimentary iron ore and pyrite. Siderite symbiosis.
[Identification characteristics] The main characteristics are green, a group of extremely complete cleavage, low hardness, and flexible sheet. The morphology and cause of occurrence are the main basis for identifying chlorite.
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