Talc (hydrated magnesium silicate) is a soft, brittle mineral of soft colloidal particles with a soapy touch. Its structure has three layers. The tetrahedral layers of silica form an octahedral layer, all of whose octahedral positions are filled with magnesium ions. The bond between the talc sheets is weaker than the bond between the kaolinite sheets, so talc is a better lubricant. It seems white when it is pure, but may turn gray, green, brown, or red with impurities. Talc is formed as a result of hydrothermal alteration and metamorphic dolomite metamorphism.
In the monoclinic system, it crystallizes as flat crystals and dense, radial and dense masses. Its effect line is white. It varies from semi-transparent to transparent. Its large sheets have a pearly sheen. Talc sheets bend but are not as elastic as mica. Its occurrence is in a perfect direction, it has irregular failure. It has a specific gravity of 2.8 and a hardness of 1 mouse. Talc contains some iron, calcium and aluminum.
It has long been valued for cosmetics and is now used in cosmetics, in paper coatings, as a filler in paints and plastics, for molding in the form of electrical insulators, heating components, chemical containers and as Ceramic raw material is used to make anti-acid wells and countertops in chemical laboratories.
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