Sentence Examples


  • The orthoschists are white mica-schists produced by the shearing of acid rocks, such as felsite and porphyry.
  • In the south of the island there are sills and dykes of felsite, quartz-porphyry, rhyolite, trachyte and pitchstone.
  • The felsite sheets are well represented in Holy Island.
  • It is worthy of note that the dykes and sheets of felsite are seldom pierced by the basalt dykes and are probably about the most recent of the intrusive rocks.
 
 

Also Mentioned In