﻿Posnjak 
  and 
  Merwin 
  — 
  Hydrated 
  Ferric 
  Oxides. 
  329 
  

  

  10 
  

  

  Fig. 
  3. 
  

  

  <V-o—6<x><> 
  

  

  /X^ 
  

  

  -* 
  

  

  /?T 
  

  

  13 
  

  

  o 
  

  

  -^— 
  . 
  

  

  100 
  

  

  300 
  

  

  100 
  200 
  300 
  

  

  Temperature 
  in 
  C° 
  

  

  Fig. 
  3. 
  Dehydration 
  to 
  constant 
  weight 
  at 
  fixed 
  temperatures. 
  Numbers 
  

   refer 
  to 
  analyses 
  in 
  Table 
  I: 
  3 
  and 
  4 
  — 
  turgite; 
  5 
  and 
  8 
  — 
  bladed 
  goethite; 
  

   7, 
  9, 
  13 
  and 
  14 
  — 
  fibrous 
  (crystallized) 
  goethite. 
  

  

  