﻿Shannon 
  — 
  Anglesite 
  from 
  Idaho. 
  

  

  291 
  

  

  The 
  crystals 
  from 
  the 
  Hypotheek 
  mine 
  are 
  ideally 
  

   suited 
  for 
  measurement 
  on 
  the 
  reflecting 
  goniometer. 
  

   The 
  accompanying 
  figures 
  show 
  the 
  predominant 
  habits 
  

   observed 
  on 
  the 
  specimens 
  obtained 
  by 
  the 
  writer. 
  As 
  

   will 
  be 
  seen, 
  the 
  habit 
  is 
  exceedingly 
  varied 
  and 
  on 
  no 
  two 
  

   specimens 
  are 
  the 
  crystals 
  exactly 
  alike. 
  The 
  most 
  com- 
  

   mon 
  type 
  is 
  that 
  shown 
  in 
  fig. 
  7, 
  although 
  a 
  number 
  of 
  

   crystals 
  like 
  fig. 
  5 
  were 
  observed. 
  

  

  Fig. 
  7. 
  

  

  Most 
  of 
  the 
  forms 
  observed 
  on 
  the 
  anglesite 
  crystals 
  

   from 
  this 
  mine 
  are 
  of 
  common 
  occurrence. 
  Only 
  two 
  

   undescribed 
  forms 
  were 
  seen 
  on 
  the 
  crystals 
  measured 
  

   and 
  these 
  were 
  represented 
  by 
  very 
  narrow 
  line 
  faces. 
  

   These 
  are 
  a 
  prism 
  (910) 
  observed 
  on 
  a 
  crystal 
  resem- 
  

   bling 
  ^g. 
  5, 
  and 
  a 
  brachydome 
  (0-1-14) 
  shown 
  on 
  1ig. 
  3. 
  

  

  The 
  forms 
  observed 
  on 
  ten 
  crystals 
  measured 
  are 
  listed 
  

   below 
  : 
  

  

  Form. 
  Symbol. 
  Times 
  observed. 
  

  

  a 
  100 
  3 
  

  

  b 
  010 
  2 
  

  

  c 
  001 
  8 
  

  

  m 
  110 
  9 
  

  

  n 
  120 
  3 
  

  

  