MICA/(my-kah)/n./ 1. A sheet silicate mineral characterized by a near perfect atomic arrangement that creates a series of hexagonal crystals in two varieties—brown, or Phlogopite, which contains iron and magnesium; and clear white, or Muscovite, which contains potassium and aluminum; /n./ 2. Derived from the Latin word Micare, meaning “to glitter,” in reference to its brilliant appearance; /n./ 3. A popular ingredient in mineral makeup that provides a hypoallergenic alternative to talc and a translucent glow to skin, e.g., “Learn to love mica, the all-natural sparkler that keeps your skin glistening sans irritation.”
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