﻿Chloride 
  upon 
  Analcite 
  and 
  Leucite. 
  123 
  

  

  Evidently, 
  the 
  desired 
  salt 
  was 
  not 
  definitely 
  obtained, 
  and 
  

   the 
  product 
  appears 
  to 
  be 
  a 
  mixture. 
  The 
  reaction, 
  however, 
  

   tends 
  in 
  the 
  right 
  direction, 
  and 
  deserves 
  further 
  study 
  under 
  

   other 
  conditions. 
  Probably 
  the 
  water 
  which 
  was 
  present 
  in 
  

   the 
  mixture 
  of 
  silicate 
  and 
  chloride 
  took 
  part 
  in 
  the 
  changes 
  

   produced 
  : 
  although 
  of 
  this 
  we 
  cannot 
  be 
  certain. 
  It 
  is 
  inter- 
  

   esting 
  to 
  note 
  that 
  the 
  product 
  obtained 
  approximates 
  in 
  com- 
  

   position 
  to 
  the 
  meteoritic 
  mineral 
  maskelynite, 
  which 
  is 
  regarded 
  

   as 
  perhaps 
  a 
  calcium 
  leucite 
  by 
  Groth. 
  

  

  The 
  question 
  now 
  arises 
  whether 
  the 
  observed 
  reaction 
  with 
  

   ammonium 
  chloride 
  is 
  limited 
  to 
  a 
  few 
  species 
  or 
  is 
  fairly 
  gen- 
  

   eral. 
  To 
  test 
  this 
  point 
  we 
  have 
  made 
  preliminary 
  experiments 
  

   upon 
  a 
  number 
  of 
  other 
  minerals, 
  heating 
  in 
  a 
  sealed 
  tube 
  to 
  

   350°, 
  with 
  the 
  following 
  results 
  : 
  The 
  percentage 
  of 
  bases 
  

   removed 
  is 
  calculated 
  in 
  each 
  case 
  upon 
  the 
  original 
  minerals 
  ; 
  

   that 
  of 
  the 
  ammonia 
  is 
  the 
  amount 
  found 
  in 
  the 
  leached 
  and 
  

   washed 
  residue. 
  

  

  Xatrolite. 
  — 
  17*56 
  per 
  cent 
  of 
  soda 
  removed, 
  8*29 
  of 
  ammonia 
  

   taken 
  up. 
  

  

  Laumontite. 
  — 
  4*51 
  of 
  lime 
  and 
  0-35 
  of 
  soda 
  removed, 
  3*95 
  

   of 
  ammonia 
  absorbed. 
  

  

  Stilhite. 
  — 
  6*51: 
  of 
  lime 
  and 
  1*31 
  of 
  soda 
  extracted, 
  5*36 
  of 
  

   ammonia 
  in 
  the 
  residue. 
  

  

  Chabazite. 
  — 
  4*37 
  of 
  lime 
  and 
  1*13 
  of 
  soda 
  removed, 
  4*55 
  of 
  

   ammonia 
  retained. 
  

  

  Thomsonite. 
  — 
  7*94 
  of 
  lime 
  and 
  3*40 
  of 
  soda 
  extracted, 
  4*01 
  

   of 
  ammonia 
  taken 
  up. 
  

  

  Heulandile. 
  — 
  4*59 
  of 
  lime 
  and 
  T59 
  of 
  soda 
  extracted, 
  3'64 
  

   of 
  ammonia 
  retained. 
  

  

  ApophyUite. 
  — 
  21*59 
  of 
  lime 
  and 
  5*18 
  of 
  potash 
  removed, 
  

   0*79 
  of 
  ammonia 
  in 
  residue. 
  

  

  Pectolite. 
  — 
  20'72 
  of 
  lime 
  and 
  6*46 
  of 
  soda 
  extracted, 
  1*44 
  of 
  

   ammonia 
  retained. 
  

  

  Elaeolite. 
  — 
  2*25 
  of 
  soda 
  taken 
  out, 
  0*74 
  of 
  ammonia 
  retained. 
  

  

  It 
  will 
  at 
  once 
  be 
  seen 
  that 
  the 
  reaction 
  takes 
  place 
  in 
  most 
  

   cases, 
  but 
  with 
  varying 
  completeness. 
  In 
  some 
  instances 
  the 
  

   decomposition 
  is 
  very 
  slight, 
  in 
  others 
  it 
  is 
  near 
  the 
  possible 
  

   limit. 
  In 
  each 
  case 
  the 
  ammonia 
  of 
  the 
  residue 
  was 
  obtained 
  

   by 
  decomposing 
  the 
  material 
  with 
  hydrochloric 
  acid, 
  supersatu- 
  

   rating 
  with 
  caustic 
  soda, 
  distilling 
  into 
  tubes 
  containing 
  hydro- 
  

   chloric 
  acid, 
  and 
  final 
  weighing 
  as 
  ammonium 
  chloroplatinate. 
  

   Each 
  of 
  the 
  minerals 
  mentioned 
  is 
  to 
  be 
  studied 
  more 
  thor- 
  

   oughly 
  hereafter, 
  and 
  prehnite, 
  sodalite, 
  and 
  possibly 
  other 
  

   silicates 
  will 
  be 
  added 
  to 
  the 
  list. 
  

  

  It 
  is 
  evident 
  that 
  all 
  of 
  the 
  zeolites 
  are 
  well 
  suited 
  to 
  this 
  

   new 
  method 
  of 
  study, 
  and 
  it 
  is 
  more 
  than 
  probable 
  that 
  the 
  

   differences 
  in 
  the 
  action 
  of 
  ammonium 
  chloride 
  upon 
  them 
  cor- 
  

  

  