Felsite

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Felsite \Fel"site\, n. [Cf. {Feldspar}.] (Min.)
     A finegrained rock, flintlike in fracture, consisting
     essentially of orthoclase feldspar with occasional grains of
     quartz.
     [1913 Webster]