﻿290 
  

  

  Shannon 
  — 
  Anglesite 
  from 
  Idaho. 
  

  

  ent 
  in 
  habit 
  and 
  more 
  orange 
  in 
  color 
  . 
  . 
  . 
  Yours 
  is 
  like 
  

   those 
  from 
  Monte 
  Poni, 
  Sardinia 
  — 
  imbedded 
  in 
  galena, 
  

   frequently 
  with 
  a 
  black 
  heart 
  of 
  unchanged 
  galena. 
  

   Occasionally 
  there 
  has 
  been 
  too 
  much 
  sulphur 
  for 
  the 
  lead 
  

   to 
  absorb, 
  leaving 
  a 
  cavity 
  with 
  a 
  perfect 
  little 
  crystal 
  

  

  Fig. 
  4. 
  

  

  m 
  

  

  VI 
  

  

  of 
  sulphur 
  in 
  it." 
  The 
  largest 
  crystal 
  observed 
  at 
  the 
  

   mine 
  was 
  about 
  an 
  inch 
  and 
  a 
  half 
  in 
  diameter 
  but 
  some 
  

   as 
  large 
  as 
  a 
  hen's 
  egg 
  are 
  said 
  to 
  be 
  frequently 
  obtained. 
  

   Cavities 
  lined 
  with 
  crystals 
  up 
  to 
  one 
  half-inch 
  in 
  diam- 
  

   eter 
  occur 
  everywhere 
  in 
  the 
  galena. 
  Where 
  a 
  little 
  

   work 
  with 
  a 
  hack 
  saw 
  and 
  a 
  light 
  hammer 
  would 
  yield 
  a 
  

  

  Fig. 
  5. 
  

  

  Fig. 
  6. 
  

  

  yx^p- 
  

  

  beautiful 
  specimen, 
  the 
  lumps 
  of 
  galena 
  are 
  struck, 
  by 
  

   the 
  miners, 
  with 
  a 
  heavy 
  hammer. 
  If 
  a 
  fairly 
  symmetri- 
  

   cal 
  group 
  of 
  crystals 
  breaks 
  out 
  it 
  is 
  preserved, 
  but 
  when, 
  

   as 
  commonly 
  happens, 
  the 
  anglesite 
  flies 
  to 
  pieces 
  or 
  the 
  

   crystals 
  break 
  loose 
  from 
  the 
  matrix, 
  the 
  whole 
  are 
  

   thrown 
  away. 
  

  

  