﻿S. 
  L. 
  Penfield 
  — 
  Graftonite, 
  a 
  new 
  Mineral. 
  23 
  

  

  

  Triphylite. 
  

  

  Graftonite. 
  

  

  

  Analysis 
  

  

  Quantity, 
  

  

  0-1668 
  gr. 
  

  

  0-5462 
  gr. 
  

  

  Ratio. 
  

  

  by 
  Ford. 
  

  

  P.O.--- 
  

  

  .. 
  42-3 
  

  

  41-20 
  

  

  •290 
  

  

  P 
  o 
  6 
  40-80 
  

  

  FeO... 
  

  

  .. 
  33*4 
  

  

  30-65 
  

  

  •426 
  "| 
  

  

  Fe 
  2 
  3 
  _.. 
  10-16 
  

  

  MnO... 
  

  

  .. 
  9-9 
  

  

  17-62 
  

  

  •248 
  1 
  

  

  FeO 
  24-28 
  

  

  MgO 
  - 
  

  

  .. 
  1-3 
  

  

  0-40 
  

  

  •010 
  y-851 
  

  

  MnO 
  15-38 
  

  

  CaO 
  . 
  . 
  _ 
  

  

  .. 
  0-2 
  

  

  9-23 
  

  

  •165 
  | 
  

  

  CaO 
  7-25 
  

  

  Li 
  2 
  0.__ 
  

  

  ._ 
  9-2 
  

  

  0-33* 
  

  

  •008 
  J 
  

  

  Na,0 
  ... 
  1-15 
  

  

  H.O... 
  

  

  ._ 
  VI 
  

  

  0-75 
  

  

  

  K 
  2 
  .... 
  -14 
  

  

  

  

  

  

  H^O 
  .... 
  1-17 
  

  

  

  OQ.fl 
  

  

  1 
  CiCi-l 
  Q 
  

  

  100-33 
  

  

  As 
  shown 
  by 
  the 
  analysis 
  of 
  the 
  graftonite, 
  alkalies 
  are 
  prac- 
  

   tically 
  wanting 
  in 
  the 
  new 
  mineral. 
  The 
  0'33 
  per 
  cent 
  recorded 
  

   as 
  Li 
  2 
  was 
  found 
  to 
  have 
  a 
  molecular 
  weight 
  of 
  44. 
  indicat- 
  

   ing 
  that 
  the 
  alkali 
  was 
  chiefly 
  lithia, 
  and 
  it 
  is 
  probable 
  that 
  it 
  

   was 
  derived, 
  for 
  the 
  most 
  part 
  at 
  least, 
  from 
  a 
  slight 
  admixture 
  

   of 
  triphylite. 
  Since 
  triphylite, 
  however, 
  is 
  a 
  normal 
  phos- 
  

   phate, 
  its 
  presence 
  in 
  very 
  small 
  quantity 
  would 
  have 
  no 
  

   appreciable 
  effect 
  upon 
  the 
  ratio 
  of 
  P 
  2 
  5 
  to 
  the 
  total 
  metallic 
  

   oxides, 
  and 
  hence 
  an 
  amount 
  of 
  triphylite 
  corresponding 
  to 
  0*33 
  

   per 
  cent 
  of 
  alkali 
  oxide 
  has 
  not 
  been 
  deducted 
  from 
  the 
  

   analysis. 
  The 
  ratio 
  of 
  P 
  2 
  5 
  : 
  RO, 
  as 
  indicated 
  by 
  the 
  analysis, 
  

   is 
  -290 
  : 
  *857 
  = 
  1 
  : 
  2*95, 
  or, 
  approximately, 
  1 
  : 
  3. 
  The 
  formula 
  

   of 
  graftonite 
  is, 
  therefore, 
  R 
  3 
  P 
  2 
  8 
  , 
  R 
  standing 
  for 
  the 
  bivalent 
  

   metals, 
  iron, 
  manganese 
  and 
  calcium, 
  which 
  evidently 
  are 
  iso- 
  

   morphous 
  with 
  one 
  another 
  and 
  not 
  present 
  in 
  fixed 
  or 
  definite 
  

   proportions. 
  In 
  Ford's 
  analysis 
  the 
  considerable 
  amount 
  of 
  

   Fe,0 
  3 
  , 
  which 
  is 
  recorded, 
  indicates 
  that 
  the 
  original 
  mineral 
  

   has 
  suffered 
  some 
  alteration, 
  attended 
  by 
  oxidation, 
  the 
  amount 
  

   of 
  oxygen 
  in 
  the 
  10*16 
  per 
  cent 
  of 
  Fe 
  2 
  3 
  in 
  excess 
  of 
  FeO 
  

   being 
  1*02 
  per 
  cent. 
  This 
  oxidation, 
  in 
  all 
  probability, 
  belongs 
  

   as 
  much 
  to 
  the 
  manganese 
  as 
  to 
  the 
  iron, 
  if 
  not 
  more. 
  If 
  the 
  

   oxidation 
  is 
  neglected, 
  and 
  the 
  iron 
  considered 
  wholly 
  as 
  FeO, 
  

   the 
  ratio 
  of 
  P 
  2 
  5 
  : 
  RO 
  in 
  Ford's 
  analysis 
  becomes 
  1 
  : 
  2*90, 
  or, 
  

   practically, 
  1:3, 
  as 
  required 
  by 
  a 
  normal 
  phosphate. 
  More- 
  

   over, 
  the 
  oxidation 
  has 
  not 
  been 
  attended 
  by 
  any 
  considerable 
  

   amount 
  of 
  hydration, 
  the 
  amount 
  of 
  water, 
  1-17 
  per 
  cent, 
  

   being 
  small. 
  

  

  From 
  a 
  chemical 
  standpoint 
  graftonite 
  is 
  interesting 
  as 
  being 
  

   one 
  of 
  the 
  very 
  few 
  anhydrous, 
  normal 
  phosphates 
  thus 
  far 
  

   observed. 
  Thus, 
  we 
  have 
  xenotime 
  and 
  monazite, 
  normal 
  

   phosphates 
  of 
  the 
  yttrium 
  and 
  cerium 
  metals, 
  and 
  the 
  minerals 
  

   of 
  the 
  triphylite 
  group, 
  characterized 
  by 
  containing 
  an 
  alkali 
  

   metal, 
  as 
  follows: 
  triphylite, 
  LiFeP0 
  4 
  ; 
  lithioplnlite, 
  LiMn 
  

   P0 
  4 
  ; 
  natrophilite, 
  NaMnPO, 
  and 
  beryllonite, 
  NaBeP0 
  4 
  , 
  

  

  * 
  Molecular 
  weight 
  44, 
  hence 
  containing 
  some 
  Xa 
  2 
  0. 
  

  

  