﻿122 
  Clarke 
  and 
  Steiger— 
  Action 
  of 
  Ammonium 
  

  

  sealed 
  tube 
  experiments 
  were 
  conducted 
  precisely 
  as 
  in 
  the 
  

   case 
  of 
  analcite, 
  and 
  they 
  confirmed 
  both 
  the 
  preliminary 
  test 
  

   and 
  our 
  anticipations. 
  Chlorides 
  were 
  formed 
  equivalent 
  to 
  

   18*53 
  per 
  cent 
  of 
  potash, 
  1-08 
  of 
  soda, 
  and 
  0'08 
  of 
  alumina; 
  

   the 
  reaction 
  therefore, 
  was 
  very 
  nearly 
  complete. 
  The 
  leached 
  

   residue 
  was 
  then 
  analyzed, 
  and 
  the 
  data, 
  compared 
  with 
  the 
  

   analysis 
  of 
  the 
  original 
  mineral, 
  were 
  as 
  follows 
  : 
  

  

  Leucite. 
  Residue. 
  

  

  Si0 
  2 
  .__ 
  55-40 
  60-63 
  

  

  A1 
  2 
  U 
  3 
  23-69 
  26-44 
  

  

  CaO 
  -J 
  6 
  trace 
  

  

  K 
  2 
  19-54 
  -50 
  

  

  Na 
  2 
  0. 
  1-25 
  -25 
  

  

  NH 
  3 
  7-35 
  

  

  ELO____ 
  -24 
  5-17 
  

  

  100-28 
  100-34 
  

  

  Leucite, 
  then, 
  gives 
  the 
  same 
  reaction 
  as 
  analcite, 
  and 
  yields 
  

   the 
  same 
  ammonium 
  compound. 
  A 
  closer 
  agreement 
  in 
  the 
  

   composition 
  of 
  the 
  latter 
  could 
  not 
  reasonably 
  be 
  demanded. 
  

   Ammonium 
  leucite 
  is 
  formed 
  in 
  both 
  cases, 
  by 
  ordinary 
  doublo 
  

   decomposition, 
  in 
  a 
  state 
  of 
  approximate 
  purity 
  ; 
  the 
  first 
  sili- 
  

   cate 
  of 
  ammonium, 
  we 
  think, 
  which 
  has 
  ever 
  been 
  prepared. 
  

   At 
  the 
  suggestion 
  of 
  Dr. 
  F. 
  K. 
  Cameron 
  an 
  attempt 
  was 
  mado 
  

   to 
  transform 
  ammonium 
  leucite 
  into 
  the 
  corresponding 
  lime 
  

   salt, 
  CaAl 
  2 
  Si 
  4 
  12 
  , 
  by 
  fusion 
  with 
  calcium 
  chloride. 
  The 
  

   ammonium 
  leucite 
  was 
  mixed 
  with 
  a 
  saturated 
  solution 
  of 
  cal- 
  

   cium 
  chloride, 
  which 
  was 
  evaporated 
  to 
  dryness, 
  then 
  heated 
  

   gradually 
  to 
  dehydration, 
  and 
  finally 
  fused. 
  Ammonium 
  

   chloride 
  was 
  given 
  off 
  and 
  identified. 
  Upon 
  treating 
  the 
  fused 
  

   mass 
  with 
  water, 
  filtering, 
  and 
  thoroughly 
  washing 
  the 
  resi- 
  

   due, 
  a 
  white 
  powder 
  was 
  obtained, 
  which 
  after 
  drying 
  at 
  100°, 
  

   was 
  analyzed. 
  It 
  was 
  also 
  examined 
  microscopically 
  by 
  Mr. 
  

   J. 
  S. 
  Diller, 
  who 
  found 
  it 
  to 
  consist 
  of 
  apparently 
  isotropic 
  

   grains, 
  showing 
  traces 
  of 
  incipient 
  crystallization. 
  The 
  follow- 
  

   ing 
  analysis 
  is 
  contrasted 
  with 
  the 
  theoretical 
  composition 
  of 
  

   calcium 
  leucite, 
  from 
  which 
  it 
  varies 
  considerably. 
  

  

  Found. 
  Calculated. 
  

  

  Si0 
  2 
  54-35 
  60-30 
  

  

  A1 
  2 
  3 
  __ 
  26-23 
  25-63 
  

  

  CaO 
  17-38 
  14-07 
  

  

  K 
  2 
  0. 
  -16 
  

  

  Na 
  2 
  0_ 
  -25 
  

  

  Cl._ 
  _ 
  -28 
  

  

  Loss 
  on 
  ignition 
  1*24 
  

  

  99-89 
  100-00 
  

  

  