#biotite  dark brown to black mica found in igneous and metamorphic rock
  supertype:  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
  subtype:  lepidomelane  a mica that is a biotite containing iron

No statement uses or specializes biotite; click here to add one.