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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Basanite  \Bas"a*nite\,  n.  [L.  basanites  lapis,  Gr  ?  the 
  touchstone:  cf  F.  basanite.]  (Min.) 
  Lydian  stone,  or  black  jasper,  a  variety  of  siliceous  or 
  flinty  slate,  of  a  grayish  or  bluish  black  color.  It  is 
  employed  to  test  the  purity  of  gold,  the  amount  of  alloy 
  being  indicated  by  the  color  left  on  the  stone  when  rubbed  by 
  the  metal.