#mica__isinglass__isinglas  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
  supertype:  mineral  transparent_substance
  subtype:  biotite  dark brown to black mica found in igneous and metamorphic rock
     subtype:  lepidomelane  a mica that is a biotite containing iron
  subtype:  lepidolite  a mineral of the mica group; an important source of lithium
  subtype:  muscovite  a colorless or pale brown mica with potassium
     subtype:  damourite  a variety of muscovite
  subtype:  paragonite  a colorless or pale brown mica with sodium
  subtype:  phlogopite  a brown form of mica consisting of hydrous silicate of potassium and magnesium and aluminum
  subtype:  zinnwaldite  a mica containing iron and lithium

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