﻿Shannon 
  — 
  Anglesite 
  from 
  Idaho. 
  289 
  

  

  formerly 
  was 
  frequently 
  found 
  in 
  cavities 
  in 
  galena 
  and 
  

   associated 
  with 
  decomposing 
  pyrite. 
  The 
  notable 
  fea- 
  

   ture 
  of 
  most 
  of 
  the 
  crystals 
  from 
  this 
  mine 
  is 
  their 
  

   extreme 
  simplicity, 
  many 
  of 
  them 
  simply 
  consisting 
  of 
  

   the 
  unit 
  prism 
  m 
  (110) 
  and 
  the 
  basal 
  pinacoid, 
  c 
  (001) 
  ; 
  

   o 
  (Oil) 
  and 
  d 
  (102) 
  are 
  also 
  seen. 
  A 
  common 
  form 
  shows 
  

   notched 
  edges 
  due 
  to 
  parallel 
  growth 
  (o). 
  A 
  crystal 
  now 
  

   in 
  the 
  Brush 
  collection 
  showing 
  c, 
  m, 
  o, 
  is 
  perfect 
  in 
  

   form 
  and 
  transparency 
  and 
  nearly 
  half-an-inch 
  in 
  diam- 
  

   eter. 
  Frequently 
  these 
  crystals 
  are 
  coated 
  on 
  the 
  prism 
  

   and 
  pinacoid 
  faces 
  with 
  limonite 
  while 
  the 
  dome 
  faces 
  

   are 
  clear 
  and 
  brilliant. 
  

  

  The 
  Hypotheek 
  mine 
  near 
  Kingston 
  has 
  produced 
  the 
  

   finest 
  crystals 
  of 
  anglesite 
  that 
  have 
  been 
  found 
  in 
  the 
  

   state. 
  Indeed 
  it 
  is 
  doubtful 
  whether 
  any 
  locality 
  in 
  the 
  

   United 
  States 
  has 
  equalled 
  this 
  mine 
  in 
  the 
  size 
  and 
  

   beauty 
  of 
  its 
  crystals. 
  The 
  ores 
  of 
  the 
  mine 
  are 
  oxidized 
  

   to 
  an 
  unusual 
  depth 
  and 
  consist 
  largely 
  of 
  cerussite. 
  

   Large 
  bunches 
  of 
  pure 
  granular 
  galena 
  occur 
  surrounded 
  

   by 
  soft 
  ocherous 
  material 
  that 
  consists 
  mainly 
  of 
  oxides 
  

   of 
  iron 
  and 
  manganese, 
  and 
  contains 
  bunches 
  of 
  cerussite, 
  

   pyromorphite, 
  malachite, 
  covellite 
  and 
  bindheimite. 
  It 
  

   is 
  in 
  cavities 
  in 
  the 
  residual 
  lumps 
  of 
  galena 
  that 
  the 
  fine 
  

   anglesite 
  crystals 
  occur. 
  These 
  crystals 
  are 
  colorless, 
  

   perfectly 
  transparent, 
  and 
  exceedingly 
  brilliant. 
  "With 
  

   two 
  exceptions 
  the 
  crystals 
  obtained 
  by 
  the 
  writer 
  in 
  

   September, 
  1916, 
  were 
  from 
  a 
  small 
  mine 
  car 
  of 
  ore 
  

   beneath 
  the 
  surface 
  ore 
  bins. 
  This 
  ore 
  had 
  been 
  shot 
  

   down, 
  shoveled 
  into 
  a 
  chute, 
  and 
  probably 
  handled 
  a 
  half- 
  

   dozen 
  times 
  through 
  cars 
  and 
  bins, 
  yet 
  after 
  this 
  pro- 
  

   longed 
  abuse, 
  the 
  protected 
  cavities 
  and 
  interiors 
  of 
  the 
  

   lumps 
  contained 
  crystals 
  equal 
  to 
  the 
  finest 
  specimens 
  

   from 
  Sardinia 
  at 
  present 
  visible 
  in 
  American 
  collections. 
  

   In 
  the 
  possession 
  of 
  Mr. 
  Thomas 
  Strick, 
  a 
  foreman 
  at 
  the 
  

   mine, 
  was 
  seen 
  a 
  lump 
  of 
  galena 
  having 
  a 
  cavity 
  several 
  

   inches 
  across, 
  lined 
  with 
  ideally 
  perfect 
  doubly-termi- 
  

   nated 
  crystals 
  an 
  inch 
  or 
  more 
  in 
  length, 
  having 
  the 
  form 
  

   shown 
  in 
  fig. 
  7. 
  Two 
  smaller 
  specimens 
  from 
  the 
  same 
  

   cavity 
  were 
  obtained 
  at 
  the 
  time. 
  One 
  of 
  these 
  is 
  now 
  

   in 
  the 
  Brush 
  Collection 
  and 
  the 
  other 
  is 
  in 
  the 
  collection 
  

   of 
  Col. 
  Roebling. 
  In 
  commenting 
  upon 
  the 
  latter 
  speci- 
  

   men, 
  Col. 
  Roebling 
  writes 
  as 
  follows 
  : 
  — 
  "Although 
  I 
  have 
  

   at 
  least 
  thirty 
  anglesites, 
  the 
  crystal 
  you 
  sent 
  is 
  the 
  best 
  

   of 
  its 
  class. 
  . 
  . 
  . 
  The 
  Broken 
  Hill 
  specimens 
  are 
  differ- 
  

  

  Am. 
  Jour. 
  Sci.— 
  Fourth 
  Series, 
  Vol. 
  XLVII, 
  No. 
  280.— 
  April, 
  1919. 
  

   20 
  

  

  