﻿128 
  T. 
  H. 
  Lee 
  — 
  Two 
  New 
  Zircon 
  Minerals. 
  

   A 
  second 
  specimen 
  had 
  this 
  composition 
  : 
  

  

  Zirconia 
  (ZrO,) 
  85-01 
  

  

  Ferric 
  oxide 
  (Fe 
  o 
  3 
  ) 
  3-57 
  

  

  Titanic 
  acid 
  (TiO,) 
  1-52 
  

  

  Silica 
  (SiO,) 
  .... 
  9-63 
  

  

  99-73 
  

  

  Later, 
  when 
  the 
  Geological 
  Service 
  had 
  new 
  material, 
  

   Dr. 
  Derby 
  by 
  using 
  a 
  needle 
  and 
  a 
  microscope 
  succeeded 
  

   in 
  separating 
  a 
  little 
  more 
  than 
  600 
  milligrams 
  of 
  the 
  vis- 
  

   ible 
  homogeneous 
  materials. 
  Of 
  this 
  two 
  parallel 
  analy- 
  

   ses 
  were 
  made 
  which 
  showed 
  beyond 
  question 
  that 
  the 
  

   material 
  was 
  homogeneous, 
  and 
  that 
  it 
  was 
  a 
  new 
  sili- 
  

   cate 
  with 
  the 
  following 
  composition: 
  

  

  Zirconia 
  6804 
  

  

  Silica 
  25-45 
  

  

  Volatile 
  matter 
  and 
  combined 
  water 
  6-35 
  

  

  .99-72 
  

  

  Dividing 
  these 
  percentages 
  by 
  the 
  molecular 
  weights 
  we 
  

   have 
  the 
  molecular 
  factors 
  : 
  

  

  Zirconia 
  0-5565 
  

  

  Silica 
  0-4220 
  

  

  Water 
  0-3516 
  

  

  Dividing 
  the 
  molecular 
  factors 
  of 
  the 
  zirconia 
  and 
  of 
  the 
  

   water 
  by 
  the 
  silica 
  we 
  have 
  : 
  

  

  Zirconia 
  1-319 
  

  

  Silica 
  1000 
  

  

  Water 
  0-833 
  

  

  Multiplying 
  by 
  three 
  we 
  have: 
  

  

  Zirconia 
  3-957 
  

  

  Silica 
  3000 
  

  

  Water 
  2-499 
  

  

  