Talc.

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1. Any crystalline form of magnesium silicate that occurs in soft flat plates, used as a lubricator or dryer. also called Talcum Powder or Soapstone. 2. A fine powder applied to the back of gypsumboard to minimize friction and permit easier sliding of bundles. 3. A hydrous magnesium aluminum silicate used as an extender in paints; helps make paint smooth.

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