phlogopite

Noun
  1. A brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum (synset 114714951)
    is a type of: isinglass, mica - any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity

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