﻿330 
  Posnjak 
  and 
  Merwin 
  — 
  Hydrated 
  Ferric 
  Oxides. 
  

  

  Fig. 
  4. 
  

  

  15 
  

  

  

  

  

  

  

  

  

  - 
  

  

  

  

  

  

  

  

  ~ 
  o^ 
  

  

  

  

  

  

  

  

  Q 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

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  )*?- 
  

  

  

  

  

  - 
  

  

  

  ^^A- 
  

  

  

  

  

  

  

  

  

  

  

  17 
  

  

  

  " 
  

  

  

  

  

  

  18 
  

  

  

  5 
  

  

  - 
  

  

  

  

  

  

  

  

  " 
  

  

  

  

  

  

  

  

  - 
  

  

  

  

  

  

  

  

  ~ 
  X 
  

  

  

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  - 
  

  

  

  

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  <-^ 
  

  

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  :\ 
  

  

  v 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  N 
  

  

  k 
  

  

  •• 
  

  

  

  

  

  

  

  

  

  

  

  

  

  - 
  

  

  

  

  

  

  

  

  

  

  

  

  fee* 
  

  

  

  

  

  - 
  

  

  

  

  

  

  

  

  

  - 
  

  

  

  

  

  

  19 
  

  

  

  - 
  

  

  

  

  

  

  22 
  

  

  

  

  

  

  

  

  

  

  

  - 
  \ 
  

  

  

  

  

  

  

  

  5 
  

  

  

  

  

  

  

  

  

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  ^-' 
  

  

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  ^9: 
  

  

  

  

  

  

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  : 
  --~ 
  

  

  ^-. 
  

  

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  15 
  

  

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  v 
  

  

  

  

  

  

  

  - 
  

  

  

  

  

  

  

  

  

  s 
  

  

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  - 
  Q 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

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  23 
  

  

  

  ~ 
  

  

  

  

  

  

  

  12 
  

  

  

  o 
  

  

  9 
  

   5 
  

  

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   c 
  

   

   o 
  

  

  I 
  x 
  

  

  

  

  

  

  

  

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  " 
  

  

  

  

  

  

  

  

  

  4) 
  

  

  CL 
  

  

  

  

  

  

  

  

  

  

  ■ 
  

  

  

  

  \ 
  

  

  I. 
  

  

  -O-H 
  

  

  

  

  100 
  

  

  Temperature 
  in 
  C° 
  

  

  Fig. 
  4. 
  Dehydration 
  to 
  constant 
  weight 
  at 
  fixed 
  temperatures. 
  Numbers 
  

   refer 
  to 
  analyses 
  in 
  Tables 
  I 
  and 
  III: 
  17 
  and 
  18 
  — 
  fibrous 
  (crystallized) 
  

   goethite; 
  19, 
  22 
  and 
  23 
  — 
  limonite 
  ("amorphous"); 
  12 
  — 
  lepidocrocite. 
  

  

  