﻿*0 
  T. 
  H. 
  Lee- 
  

   Tantalic 
  acid 
  

  

  -Two 
  New 
  Zircon 
  Minerals. 
  

   Euxenite. 
  

  

  Espirito 
  Santo 
  Pomba, 
  Minas 
  

   3-20 
  1-46 
  

  

  Columbic 
  acid 
  .... 
  

  

  

  28-70 
  

  

  36-39 
  

  

  Titanic 
  acid 
  

  

  

  23-70 
  

  

  2500 
  

  

  Oxide 
  of 
  cerium 
  

  

  Oxide 
  yttrium 
  (group) 
  

  

  Oxide 
  zirconium 
  

  

  Oxide 
  uranium 
  

  

  Oxide 
  lead 
  r 
  

  

  ......... 
  2342 
  .... 
  

  

  •46 
  

   2308 
  

  

  4-23 
  . 
  . 
  . 
  . 
  

  

  7-50 
  

  

  14 
  

  

  '. 
  '. 
  '. 
  '. 
  1006 
  

   14 
  

  

  Oxide 
  tin 
  (traces) 
  

   Oxide 
  iron 
  

  

  

  ......... 
  342 
  .... 
  

  

  

  Combined 
  water 
  . 
  . 
  

  

  

  6-41 
  

  

  2-41 
  

  

  

  

  

  

  

  100-12 
  . 
  . 
  . 
  . 
  

  

  . 
  . 
  . 
  . 
  9900 
  

  

  At 
  first, 
  as 
  is 
  shown 
  by 
  the 
  anaylsis 
  of 
  the 
  euxenite 
  from 
  

   Pomba, 
  the 
  zirconia 
  was 
  not 
  determined 
  by 
  me, 
  but 
  was 
  

   included 
  with 
  the 
  columbic 
  acid. 
  

  

  Upon 
  reexamining 
  the 
  material 
  and 
  also 
  what 
  the 
  

   same 
  collector 
  brought 
  in 
  March, 
  1914, 
  I 
  verified 
  the 
  

   existence 
  of 
  a 
  new 
  mineral, 
  a 
  hydrated 
  titanate 
  of 
  zir- 
  

   conium. 
  

  

  Having 
  separated 
  the 
  mineral 
  I 
  submitted 
  it 
  to 
  

   Dr. 
  E. 
  Rimann, 
  at 
  that 
  time 
  the 
  petrographer 
  of 
  the 
  

   Geological 
  Service, 
  who 
  made 
  this 
  note: 
  

  

  "It 
  shows 
  no 
  distinct 
  crystalline 
  structure, 
  but 
  is 
  

   amorphous; 
  its 
  color 
  in 
  thin 
  fragments 
  is 
  a 
  yellowish 
  

   green 
  and 
  shows 
  in 
  places 
  multiple 
  twinning 
  and 
  a 
  fibro- 
  

   radial 
  structure 
  approximating 
  radio-spherulitic. 
  Its 
  

   optical 
  characters 
  correspond 
  more 
  or 
  less 
  with 
  those 
  

   produced 
  in 
  amorphous 
  minerals 
  in 
  general 
  by 
  high 
  pres- 
  

   sure, 
  a 
  correspondence 
  increased 
  by 
  the 
  fact 
  that 
  the 
  

   double 
  refraction 
  and 
  the 
  fibro-radial 
  structure 
  are 
  

   strictly 
  limited 
  to 
  the 
  highly 
  sheltered 
  area 
  of 
  the 
  min- 
  

   eral. 
  Neither 
  crystalline 
  faces 
  nor 
  cleavage 
  can 
  be 
  

   seen." 
  

  

  Where 
  the 
  mineral 
  is 
  entirely 
  free 
  from 
  foreign 
  bodies 
  

   it 
  is 
  of 
  a 
  greenish 
  yellow 
  color. 
  A 
  quantity 
  of 
  it 
  sep- 
  

   arated 
  under 
  the 
  microscope 
  by 
  Derby 
  gave 
  the 
  follow- 
  

   ing 
  results 
  when 
  analyzed: 
  

  

  Zirconia, 
  Zr0 
  o 
  ' 
  63-36 
  

  

  Anhvdrons 
  titanic 
  acid, 
  TiO„ 
  29-92 
  

  

  Combined 
  water 
  

  

  6-48 
  

  

  99-76 
  

  

  