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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Geyserite  \Gey"ser*ite\,  n.  [From  {Geyser}.]  (Min.) 
  A  loose  hydrated  form  of  silica,  a  variety  of  opal,  deposited 
  in  concretionary  cauliflowerlike  masses,  around  some  hot 
  springs  and  geysers.