﻿Notes 
  upon 
  the 
  Lithology 
  of 
  the 
  Adibondacks. 
  93 
  

  

  of 
  sound 
  between 
  Quantivalents 
  and 
  Quantivalence. 
  For 
  this 
  

   reason, 
  following 
  the 
  analogy 
  of 
  the 
  substitution 
  of 
  the 
  shorter 
  

   terms, 
  monad, 
  dyad, 
  triad, 
  etc., 
  for 
  their 
  synonyms, 
  univalent, 
  

   divalent 
  and 
  trivalent 
  radical, 
  Quantivalents 
  might 
  be 
  abbre- 
  

   viated 
  into 
  Quantads. 
  They 
  have 
  elsewhere 
  been 
  styled 
  

   Chemical 
  Units. 
  

  

  It 
  will 
  be 
  seen 
  that 
  the 
  Quantivalent 
  Ratio 
  R" 
  : 
  R 
  VI 
  : 
  Si 
  IV 
  is 
  

   1.13 
  :' 
  3 
  : 
  6.83, 
  and 
  the 
  comparison 
  with 
  the 
  quantivalent 
  ratios 
  

   of 
  related 
  minerals 
  will 
  be 
  made 
  in 
  its 
  proper 
  place 
  farther 
  on. 
  

   The 
  Atomic 
  Ratios 
  are 
  as 
  follows 
  : 
  

  

  ]S 
  T 
  a 
  (K) 
  

  

  Ca 
  (Mg, 
  Fe) 
  

  

  = 
  .1605 
  

  

  .2193 
  = 
  

  

  = 
  1 
  

  

  1.4 
  

  

  JSTa 
  

  

  Ca 
  

  

  = 
  .1410 
  

  

  .1928 
  = 
  

  

  = 
  1 
  

  

  1.4 
  

  

  Al 
  (Fe) 
  

  

  Si 
  

  

  = 
  .2658 
  

  

  .9079 
  = 
  

  

  = 
  1 
  

  

  3.4 
  

  

  Al 
  

  

  : 
  Si 
  

  

  = 
  .2577 
  

  

  .9079 
  = 
  

  

  = 
  1 
  

  

  3.5 
  

  

  Then 
  on 
  the 
  supposition 
  that 
  labradorites 
  are 
  mixtures 
  of 
  

   Anorthite 
  and 
  Albite 
  in 
  various, 
  but 
  definite 
  relative 
  propor- 
  

   tions, 
  a 
  hypothesis 
  presently 
  to 
  be 
  discussed, 
  the 
  constitution 
  

   of 
  this 
  variety 
  might 
  be 
  expressed 
  by 
  

  

  3 
  Mol. 
  Anorthite 
  + 
  1 
  Mol. 
  Albite, 
  or 
  3 
  Ca 
  Al 
  Si 
  2 
  8 
  

  

  Na 
  2 
  Al 
  Si 
  6 
  16 
  

  

  Computation 
  of 
  Analysis 
  B. 
  

  

  Silicon 
  

  

  Aluminum 
  (Al) 
  

   FerriGum 
  (Fe). 
  

  

  Ferrosum 
  

  

  Calcium 
  

  

  Magnesium 
  . 
  . 
  . 
  

   Potassium 
  .... 
  

   Sodium 
  

  

  Radicals. 
  

  

  25.49 
  

  

  14.10 
  

   0.4394 
  

   0.5299 
  

   7.057 
  

   0.444 
  

   1.02 
  

   3.339 
  

  

  Atoms. 
  

  

  0.9104 
  

   0.2583 
  

   0.0048 
  

   0.0078 
  

   0.1764 
  

   0.0185 
  

   0.0261 
  

   0.1451 
  

  

  3.6416 
  

   1.5498 
  

   0.0288 
  

   0.0156] 
  

   0.3528 
  I 
  

   0.0370 
  \ 
  

   0.0261 
  

   0.1451 
  

  

  Quantivalents. 
  

  

  3.6416 
  

  

  1.5786 
  

  

  Ratio. 
  

  

  6.92 
  

   3 
  

  

  0.5766 
  1.09 
  

  

  The 
  quantivalent 
  ratio 
  for 
  R? 
  : 
  R 
  VI 
  : 
  Si 
  Iv 
  isl.09 
  : 
  3 
  : 
  6.92, 
  

   which 
  differs 
  so 
  slightly 
  from 
  that 
  of 
  A, 
  that 
  if, 
  as 
  is 
  customary, 
  

   the 
  ratios 
  had 
  been 
  carried 
  out 
  only 
  to 
  the 
  first 
  place 
  of 
  deci- 
  

   mals, 
  they 
  would 
  have 
  been 
  identical 
  in 
  the 
  two 
  varieties 
  of 
  

   labradorite. 
  The 
  atomic 
  ratios 
  are 
  : 
  — 
  

  

  Na 
  (K) 
  : 
  

  

  Ca 
  (Mg, 
  Fe) 
  = 
  

  

  = 
  .1712 
  

  

  .2027 
  = 
  

  

  = 
  1 
  

  

  1.12 
  

  

  Na 
  

  

  Ca 
  

  

  = 
  .1451 
  

  

  . 
  .1764 
  = 
  

  

  = 
  1 
  

  

  1.22 
  

  

  Al 
  (Fe) 
  

  

  : 
  Si 
  

  

  = 
  .2631 
  

  

  .9104 
  = 
  

  

  = 
  1 
  

  

  3.46 
  

  

  Al 
  

  

  : 
  Si 
  

  

  = 
  .2583 
  

  

  .9104 
  = 
  

  

  = 
  1 
  

  

  3.52 
  

  

  