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hornstone

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hornstone


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Hornstone  \Horn"stone`\,  n.  (Min.) 
  A  siliceous  stone,  a  variety  of  quartz,  closely  resembling 
  flint,  but  more  brittle;  --  called  also  {chert}. 
 
  From  WordNet  r  1.6  [wn]: 
 
  hornstone 
  n  :  a  fine-grained  metamorphic  rock  formed  by  the  action  of  heat 
  on  clay  rocks  [syn:  {hornfels}] 




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