hydromica schist

1 definition found

hydromica schist - Collaborative International Dictionary of English v.0.48 :

  Hydromica \Hy`dro*mi"ca\, n. [Hydro-, 1 + mica.] (Min.)
     A variety of potash mica containing water. It is less elastic
     than ordinary muscovite.
     [1913 Webster]
  
     Hydromica schist (Min.), a mica schist characterized by the
        presence of hydromica. It often has a silky luster and
        almost soapy feel.
        [1913 Webster]