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Talc, or talcum, is a clay mineral composed of hydrated magnesium silicate, with the chemical formula Mg 3 Si 4 O 10 (OH) 2. Talc in powdered form, often combined with corn starch, is used as baby powder. This mineral is used as a thickening agent and lubricant. It is an ingredient in ceramics, paints, and roofing material.
Unlike natural magnesium silicates like talc, forsterite, and olivine which are crystalline, synthetic magnesium silicates are amorphous. [1] Synthetic magnesium silicates are insoluble in water or alcohol. [4] The particles are usually porous, and the BET surface area can range from less than 100 m 2 /g to several hundred m 2 /g.
Magnesium is absorbed orally at about 30% bioavailability from any water soluble salt, such as magnesium chloride or magnesium citrate. The citrate is the least expensive soluble (high bioavailability) oral magnesium salt available in supplements, with 100 mg and 200 mg magnesium typically contained per capsule, tablet or 50 mg/mL in solution. [26]
Researchers suspect that magnesium decreases cortisol in the body (the stress hormone). Improves sleep. Wong says she mixes 300 mg of magnesium powder into a glass of water before bed, to help her ...
Sepiolite is a hydrous magnesium silicate [7] having the chemical formula Mg 4 Si 6 O 15 (OH) 2 ·6H 2 O. Sepiolite can be identified in hand specimen by applying a drop of a saturated solution of methyl orange on the sample. A positive test result for sepiolite turns purple. [8]
Chemically, it is hydrated sodium calcium aluminium magnesium silicate hydroxide (Na,Ca) 0.33 (Al,Mg) 2 (Si 4 O 10)(OH) 2 ·nH 2 O. Potassium, iron, and other cations are common substitutes, and the exact ratio of cations varies with source. It often occurs intermixed with chlorite, muscovite, illite, cookeite, and kaolinite.