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dolerite


dolerite

 

  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Dolerite  \Dol"er*ite\,  n.  [Gr.  ?  deceptive,  because  easily 
  confounded  with  diorite.]  (Petrography) 
  a  A  dark,  crystalline,  igneous  rock,  chiefly  pyroxene 
  with  labradorite. 
  b  Coarse-grained  basalt. 
  c  Diabase. 
  d  Any  dark,  igneous  rock  composed  chiefly  of  silicates 
  of  iron  and  magnesium  with  some  feldspar.  -- 
  {Dol`er*it"ic},  a. 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Dolerite  \Dol"er*ite\,  n.  [Gr.  ?  deceitful;  because  it  was 
  easily  confounded  with  diorite.]  (Geol.  &  Min.) 
  A  dark-colored,  basic,  igneous  rock,  composed  essentially  of 
  pyroxene  and  a  triclinic  feldspar  with  magnetic  iron.  By  many 
  authors  it  is  considered  equivalent  to  a  coarse-grained 
  basalt.