﻿T. 
  H. 
  Lee 
  — 
  Ttvo 
  Neiv 
  Zircon 
  Minerals. 
  129 
  

  

  Equal 
  to 
  

  

  4Zr0 
  2 
  .3Si0 
  2 
  .2-5H 
  2 
  

   or 
  

  

  8Zr0 
  2 
  .6Si0 
  2 
  .5H 
  2 
  0. 
  

  

  It 
  seems 
  possible 
  that 
  the 
  high 
  molecular 
  weight 
  and 
  

   the 
  consequent 
  constitutional 
  complexity 
  corresponding 
  

   to 
  this 
  formula 
  may 
  be 
  responsible 
  for 
  the 
  facility 
  with 
  

   which 
  the 
  mixture 
  of 
  hydrofluoric 
  and 
  hydrochloric 
  acids 
  

   attacks 
  and 
  dissolves 
  it. 
  

  

  Inasmuch 
  as 
  the 
  identification 
  of 
  this 
  new 
  mineral 
  

   species 
  was 
  due 
  entirely 
  to 
  the 
  efforts 
  and 
  labors 
  of 
  Dr. 
  

   Derby, 
  I 
  have 
  the 
  honor 
  to 
  propose 
  for 
  it 
  the 
  name 
  of 
  

   OrviUite. 
  

  

  II. 
  Oliveieaite. 
  

  

  My 
  attention 
  was 
  called 
  to 
  the 
  mineral 
  euxenite 
  in 
  

   June, 
  1910, 
  by 
  a 
  specimen 
  given 
  me 
  for 
  analysis 
  by 
  my 
  

   colleague 
  Jorge 
  de 
  Araujo 
  Ferraz. 
  There 
  was 
  very 
  

   little 
  of 
  the 
  material 
  however. 
  About 
  a 
  year 
  later 
  there 
  

   was 
  a 
  discussion 
  in 
  one 
  of 
  our 
  periodicals 
  in 
  regard 
  to 
  a 
  

   new 
  element 
  derived 
  from 
  a 
  mineral 
  which, 
  thanks 
  to 
  the 
  

   studies 
  of 
  our 
  learned 
  Professor 
  Paes 
  Leme 
  of 
  our 
  

   museum, 
  was 
  shown 
  to 
  be 
  not 
  a 
  new 
  element, 
  but 
  an 
  

   oxide 
  of 
  the 
  rare 
  earths 
  composing 
  the 
  mineral 
  euxenite. 
  

  

  In 
  August, 
  1913, 
  by 
  order 
  of 
  Dr. 
  0. 
  A. 
  Derby, 
  then 
  

   director 
  of 
  the 
  Servico 
  Geologico, 
  I 
  had 
  the 
  pleasure 
  of 
  

   receiving 
  a 
  large 
  number 
  of 
  specimens 
  of 
  this 
  material 
  

   from 
  my 
  colleague 
  who 
  visited 
  the 
  place 
  at 
  which 
  they 
  

   occur 
  on 
  the 
  fazenda 
  Santa 
  Clara, 
  Tocantins 
  station, 
  on 
  

   the 
  Leopoldina 
  railway 
  in 
  the 
  municipality 
  of 
  Pomba, 
  

   State 
  of 
  Minas 
  Geraes. 
  I 
  made 
  several 
  analyses 
  of 
  the 
  

   material, 
  and 
  the 
  results 
  were 
  always 
  in 
  approximate 
  

   agreement 
  with 
  those 
  made 
  at 
  the 
  Escola 
  de 
  Minas, 
  and 
  

   with 
  one 
  made 
  at 
  the 
  Royal 
  Polytechnic 
  School 
  at 
  Turin 
  

   and 
  shown 
  me 
  by 
  my 
  colleague 
  Ferraz. 
  Thanks 
  to 
  the 
  

   efforts 
  of 
  Professor 
  Paes 
  Leme 
  I 
  obtained 
  a 
  small 
  bit 
  of 
  

   material 
  from 
  an 
  uncertain 
  locality 
  in 
  E 
  spirit 
  o 
  Santo 
  

   from 
  which 
  it 
  was 
  said 
  the 
  new 
  element 
  had 
  been 
  

   obtained. 
  

  

  In 
  order 
  to 
  have 
  a 
  clear 
  idea 
  of 
  the 
  similarity 
  of 
  the 
  

   materials 
  from 
  the 
  two 
  different 
  places 
  I 
  give 
  here 
  the 
  

   results 
  of 
  the 
  analvses: 
  

  

  