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gneiss

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gneiss


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Gneiss  \Gneiss\  (n[imac]s),  n.  [G.]  (Geol.) 
  A  crystalline  rock,  consisting,  like  granite,  of  quartz, 
  feldspar,  and  mica,  but  having  these  materials,  especially 
  the  mica,  arranged  in  planes,  so  that  it  breaks  rather  easily 
  into  coarse  slabs  or  flags.  Hornblende  sometimes  takes  the 
  place  of  the  mica,  and  it  is  then  called  {hornblendic  or 
  syenitic  gneiss}.  Similar  varieties  of  related  rocks  are  also 
  called  gneiss. 
 
  From  WordNet  r  1.6  [wn]: 
 
  gneiss 
  n  :  a  laminated  metamorphic  rock  similar  to  granite 




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