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magnesium silicate

noun Chemistry.
  1. a white powder, 3MgSiO3⋅5H2O, with variable hydration, insoluble in water or alcohol, used as a rubber filler, a bleaching agent, an odor absorbent, and in the manufacture of paints and resins.
  2. any silicate containing magnesium, as enstatite, talc, or magnesium trisilicate.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018