﻿T. 
  H. 
  Lee 
  — 
  Tivo 
  Neiv 
  Zircon 
  Minerals. 
  131 
  

  

  Dividing 
  these 
  percentages 
  by 
  the 
  proper 
  molecular 
  

   weight 
  we 
  have 
  : 
  

  

  Zirconia 
  0-517 
  

  

  Titanic 
  acid 
  0-373 
  

  

  Water 
  0-360 
  

  

  Dividing 
  the 
  molecular 
  proportions 
  by 
  the 
  zirconia 
  we 
  

   have: 
  

  

  Zirconia 
  1-000 
  

  

  Titanic 
  acid 
  -7215 
  

  

  Water 
  -6963 
  

  

  Multiplying 
  by 
  three 
  we 
  have 
  : 
  

  

  Zirconia 
  3-00 
  

  

  Titanic 
  acid 
  2-16 
  

  

  Water 
  2-09 
  

  

  or 
  

  

  3ZrO, 
  2Ti0 
  9 
  2H 
  o 
  0. 
  

  

  I 
  propose 
  for 
  this 
  new 
  mineral 
  the 
  name 
  of 
  oliveiraite 
  

   in 
  honor 
  of 
  the 
  veteran 
  geologist 
  Dr. 
  Francisco 
  de 
  Paula 
  

   Oliveira, 
  who 
  has 
  been 
  so 
  long 
  associated 
  with 
  Dr. 
  

   Orville 
  Derby 
  in 
  the 
  work 
  upon 
  the 
  geology 
  of 
  this 
  

   country. 
  The 
  presence 
  of 
  the 
  oxide 
  of 
  zirconium 
  in 
  

   euxenite 
  explains 
  the 
  origin 
  of 
  the 
  new 
  mineral 
  as 
  a 
  sec- 
  

   ondary 
  product 
  of 
  it. 
  

  

  Almost 
  all 
  of 
  the 
  crystals 
  of 
  euxenite 
  are 
  covered 
  with 
  

   a 
  yellow 
  crust 
  that 
  has 
  the 
  following 
  approximate 
  com- 
  

   position 
  : 
  

  

  Columbic 
  acid, 
  Cb 
  2 
  5 
  ) 
  r 
  2-H 
  

   Including 
  tantalic 
  acid, 
  Ta 
  o 
  5 
  ) 
  

  

  Titanic 
  acid, 
  Ti0 
  9 
  25-00 
  

  

  Rare 
  earths, 
  R>0 
  3 
  7-40 
  

  

  Oxide 
  of 
  uranium, 
  U0 
  3 
  2 
  4-93 
  

  

  Combined 
  water 
  11-14 
  

  

  100-98 
  

  

  - 
  On 
  decomposition 
  the 
  uranium 
  is 
  present 
  in 
  the 
  form 
  of 
  the 
  oxide 
  U0 
  3 
  , 
  

   and 
  in 
  the 
  unaltered 
  mineral 
  in 
  the 
  form 
  of 
  TJCK. 
  

  

  