﻿Zirconium 
  with 
  Lithium, 
  Sodium 
  and 
  Thallium. 
  469 
  

  

  crops 
  analyzed. 
  Once, 
  however, 
  it 
  was 
  obtained 
  mixed 
  with 
  

   the 
  2 
  : 
  1 
  salt, 
  as 
  seen 
  under 
  the 
  microscope, 
  showing 
  there 
  

   could 
  probably 
  be 
  no 
  intermediate 
  salt. 
  Various 
  conditions 
  

   were 
  tried 
  and 
  crops 
  were 
  obtained 
  from 
  both 
  hot 
  and 
  cold 
  

   solutions. 
  It 
  forms 
  when 
  5 
  to 
  7 
  g 
  of 
  lithium 
  fluoride 
  are 
  

   mixed 
  with 
  20 
  g 
  of 
  zirconium 
  fluoride. 
  On 
  recrystallizing, 
  

   lithium 
  fluoride 
  is 
  precipitated. 
  

  

  Following 
  are 
  the 
  results 
  of 
  the 
  analyses 
  : 
  

  

  Li. 
  Zr. 
  H 
  2 
  0. 
  F. 
  

  

  I 
  9-54 
  33-14 
  4-83 
  

  

  II 
  _ 
  4-93 
  

  

  III 
  9'19 
  33-30 
  4-35 
  53*16 
  

  

  IV 
  33-23 
  ____ 
  

  

  V 
  _ 
  33-02 
  

  

  Calculated 
  for 
  Li 
  4 
  ZrF 
  8 
  .|H 
  2 
  0-_. 
  9-93 
  31-91 
  4-26 
  53-90 
  

  

  Salts 
  of 
  Sodium. 
  

  

  %NaF 
  . 
  ZrF±. 
  — 
  This 
  salt 
  crystallizes 
  in 
  very 
  minute 
  crystals 
  

   of 
  hexagonal 
  outline, 
  coming 
  down 
  in 
  a 
  crust 
  when 
  from 
  one 
  

   to 
  two 
  parts 
  of 
  sodium 
  fluoride 
  are 
  added 
  to 
  fourteen 
  parts 
  of 
  

   zirconium 
  fluoride. 
  The 
  salt 
  does 
  not 
  recrystallize. 
  The 
  fol- 
  

   lowing 
  results 
  were 
  obtained 
  from 
  separate 
  crops. 
  The 
  water 
  

   was 
  probably 
  mechanically 
  included. 
  

  

  Calculated 
  for 
  

   I. 
  II. 
  Na 
  2 
  ZrF 
  6 
  . 
  

  

  Na 
  18-66 
  18-41 
  18*40 
  

  

  Zr 
  34-78 
  36-21 
  36-00 
  

  

  H 
  2 
  0__. 
  1-96 
  0-50 
  

  

  F* 
  .... 
  44-60 
  44-88 
  45-60 
  

  

  SJVaF. 
  %ZrF^. 
  — 
  Marignac 
  has 
  previously 
  described 
  this 
  salt, 
  

   which 
  comes 
  down 
  under 
  wide 
  conditions 
  in 
  very 
  good 
  crys- 
  

   tals 
  and 
  recrystallizes 
  easily. 
  Prof. 
  L. 
  V. 
  Pirsson 
  has 
  kindly 
  

   examined 
  the 
  crystals 
  and 
  made 
  the 
  following 
  report 
  : 
  

  

  " 
  The 
  crystals 
  show 
  good 
  sharp 
  forms 
  but 
  are 
  very 
  small. 
  

   They 
  appear 
  distinctly 
  orthorhombic 
  in 
  habit, 
  consisting 
  in 
  the 
  

   main 
  of 
  rather 
  stout 
  prisms, 
  made 
  up 
  of 
  two 
  prismatic 
  planes, 
  m 
  

   and 
  m' 
  and 
  terminated 
  by 
  a 
  rather 
  steep 
  brachydome. 
  In 
  

   another 
  habit, 
  which 
  is 
  rarer, 
  the 
  front 
  pinacoid, 
  a, 
  is 
  broadly 
  

   developed 
  while 
  the 
  prisms 
  are 
  very 
  small; 
  this 
  type 
  also, 
  

   shows 
  at 
  times 
  a 
  pyramid, 
  p. 
  The 
  plane 
  of 
  the 
  optic 
  axes 
  lies 
  

   in 
  the 
  base 
  and 
  a 
  = 
  c, 
  b 
  = 
  a, 
  o 
  = 
  b. 
  The 
  optic 
  angle 
  is 
  large 
  

   and 
  it 
  could 
  not 
  be 
  told 
  whether 
  a 
  or 
  b 
  was 
  the 
  acute 
  bisectrix. 
  

   The 
  double 
  refraction 
  is 
  very 
  low. 
  The 
  crystals 
  in 
  their 
  form 
  

   strongly 
  recall 
  the 
  figures 
  of 
  chrysolite 
  (olivine) 
  shown 
  in 
  the 
  

   mineralogies." 
  

  

  * 
  By 
  difference. 
  

  

  