﻿F 
  W. 
  Clarice 
  — 
  Constitution 
  of 
  Melilite 
  and 
  Gehlenite. 
  479 
  

  

  

  1 
  

  

  2 
  

  

  3 
  

  

  4 
  

  

  5 
  

  

  6 
  

  

  7 
  

  

  Si0 
  

  

  40-69 
  

  

  39-27 
  

  

  38-34 
  

  

  41-09 
  

  

  40-14 
  

  

  39-20 
  

  

  42-07 
  

  

  TiO, 
  

  

  

  

  _ 
  m 
  

  

  

  

  

  

  trace 
  

  

  trace 
  

  

  •20 
  

  

  A1,0, 
  

  

  10-88 
  

  

  6-42 
  

  

  8-61 
  

  

  10*93 
  

  

  6-47 
  

  

  7-56 
  

  

  10-50 
  

  

  Fe 
  n 
  O, 
  

  

  4-43 
  

  

  10-17 
  

  

  10-02 
  

  

  3-40 
  

  

  9-95 
  

  

  11-34 
  

  

  •30 
  

  

  FeO 
  

  

  _ 
  _ 
  , 
  

  

  - 
  - 
  - 
  •- 
  

  

  _ 
  _ 
  - 
  _ 
  

  

  _ 
  — 
  - 
  - 
  

  

  •53 
  

  

  

  

  2-18 
  

  

  MnO 
  

  

  

  

  - 
  — 
  - 
  - 
  

  

  

  

  • 
  _ 
  _ 
  - 
  

  

  trace 
  

  

  trace 
  

  

  •16 
  

  

  CaO 
  

  

  31-81 
  

  

  32-47 
  

  

  32-05 
  

  

  34-78 
  

  

  32-98 
  

  

  32-18 
  

  

  35-41 
  

  

  MgO 
  

  

  5-75 
  

  

  6-44 
  

  

  6-71 
  

  

  5-87 
  

  

  6-33 
  

  

  6-41 
  

  

  4-15 
  

  

  Na,0 
  

  

  4-43 
  

  

  1-95 
  

  

  2-12 
  

  

  3-40 
  

  

  2-18 
  

  

  2-21 
  

  

  3-24 
  

  

  K 
  n 
  O 
  

  

  •36 
  

  

  1-46 
  

  

  1-51 
  

  

  •68 
  

  

  1-49 
  

  

  1-45 
  

  

  trace 
  

  

  H 
  

  

  

  

  . 
  - 
  . 
  . 
  

  

  

  

  •24 
  

  

  •27 
  

  

  •21 
  

  

  •47 
  

  

  p.o, 
  

  

  . 
  

  

  

  

  

  

  

  

  

  

  _ 
  _ 
  _ 
  . 
  

  

  •82 
  

  

  co 
  2 
  

  

  

  

  

  

  

  

  

  

  

  

  

  •90 
  

  

  98'35 
  9818 
  99*36 
  100'39 
  100*34 
  100*56 
  100*40 
  

  

  Reducing 
  these 
  analyses 
  to 
  standard 
  form, 
  by 
  computing 
  

   Fe 
  2 
  3 
  into 
  its 
  equivalent 
  of 
  A1 
  2 
  3 
  ; 
  FeO, 
  MnO, 
  and 
  MgO 
  into 
  

   CaO 
  ; 
  K 
  2 
  into 
  Na 
  2 
  0, 
  and 
  recalculating 
  to 
  100 
  per 
  cent, 
  the 
  

   data 
  become 
  comparable 
  as 
  shown 
  in 
  the 
  next 
  table. 
  The 
  

   P 
  2 
  0. 
  and 
  C0 
  2 
  of 
  the 
  Colorado 
  mineral 
  are 
  reckoned 
  as 
  repre- 
  

   senting 
  calcium 
  phosphate 
  and 
  carbonate, 
  and 
  rejected. 
  

  

  Reduced 
  analyses 
  of 
  melilite. 
  

  

  

  l 
  

  

  2 
  

  

  3 
  

  

  4 
  

  

  5 
  

  

  6 
  

  

  7 
  

  

  SiO„ 
  

  

  41-13 
  

  

  40*67 
  

  

  39*16 
  

  

  40*76 
  

  

  40-84 
  

  

  39-88 
  

  

  43-41 
  

  

  Al 
  o 
  ? 
  

  

  13-85 
  

  

  13 
  36 
  

  

  15-32 
  

  

  13-01 
  

  

  13-03 
  

  

  15-05 
  

  

  10-92 
  

  

  CaO 
  

  

  40 
  31 
  

  

  42-96 
  

  

  42-33 
  

  

  42-41 
  

  

  42-98 
  

  

  41-86 
  

  

  42-34 
  

  

  Na 
  2 
  

  

  4-71 
  

  

  3-01 
  

  

  3-19 
  

  

  3-82 
  

  

  315 
  

  

  3-21 
  

  

  3 
  33 
  

  

  100-00 
  100-00 
  100-00 
  100-00 
  100 
  00 
  100-00 
  100-00 
  

  

  From 
  these 
  reduced 
  analyses 
  the 
  following 
  formulae 
  are 
  

   derived 
  : 
  

  

  1. 
  7Al 
  4 
  (Si 
  s 
  9 
  ) 
  6 
  Ca,Na 
  4 
  + 
  8lAl.(SiO.).Ca,Na 
  4 
  + 
  62AI 
  l 
  (Si0 
  4 
  )„Ca, 
  

  

  2. 
  6A1 
  4 
  (Si 
  3 
  8 
  ) 
  6 
  Oa 
  4 
  Na 
  4 
  + 
  18Al.(SiO 
  t 
  )„Ca,Na. 
  + 
  6Al 
  4 
  (Si0 
  4 
  )„Ca 
  6 
  

  

  + 
  7oAl,(SiO.) 
  a 
  Ca 
  9 
  . 
  

  

  3. 
  2Al.(Si,O 
  i 
  ).Ca,Na 
  t 
  + 
  24Al,(SiO 
  4 
  ) 
  Ca 
  4 
  Na 
  4 
  + 
  l0Al.(SiO.).Ca. 
  

  

  + 
  6uAl 
  s 
  (SiO,),Ca,. 
  

  

  4. 
  7Al 
  4 
  (Si 
  3 
  8 
  ) 
  6 
  Ca 
  4 
  Na, 
  + 
  2lAl 
  4 
  (Si0 
  4 
  )„Ca 
  4 
  Na 
  4 
  + 
  72Al,(Si0 
  4 
  ),Ca 
  9 
  . 
  

  

  5. 
  7A1 
  4 
  (Si 
  3 
  0,),Ca 
  4 
  Na 
  4 
  4- 
  19Al,(Si0 
  4 
  ) 
  € 
  Ca 
  4 
  Na 
  4 
  4- 
  lAl 
  4 
  (SiO,).Ca, 
  

  

  4- 
  78Al,(SiO.).<K 
  

  

  6. 
  4Al 
  4 
  (Si 
  ! 
  8 
  ) 
  t 
  Ca 
  4 
  Na 
  4 
  4- 
  22Al 
  4 
  (SiO.),Ca 
  4 
  Na 
  4 
  + 
  19Al 
  4 
  (Si0 
  4 
  ) 
  6 
  Ca 
  8 
  

  

  + 
  60Al,(SiO 
  4 
  )„Ca,. 
  

  

  7. 
  13Al 
  4 
  (Si 
  3 
  O 
  s 
  )„Ca 
  4 
  Na 
  4 
  4- 
  14Al 
  4 
  (Si0 
  4 
  ),Ca 
  4 
  Na 
  4 
  4- 
  67Al,(Si0 
  4 
  )„Ca,. 
  

  

  These 
  correspond 
  to 
  the 
  following 
  calculated 
  analyses 
  : 
  

  

  