Talc is a layered, hydrous magnesium silicate mineral. It has a soft, soapy feel and typically a smooth texture. Talc is also known for its insulation, heat resistance, chemical stability, oil absorption and strong covering quality.Talc, Mg_3Si_4O_(10)(OH)_2, has a theoretical chemical composition of MgO at 31.7 percent, SiO_2 at 63.5 percent and H_2O at 4.8 percent. Talc's chemical composition can vary depending on its geological history/parent rock association. Two key elemental substitutions in the talc crystal structure are iron for magnesium and fluorine for hydroxyl.
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