﻿392 
  W. 
  F. 
  Hillebrand 
  — 
  Analyses 
  of 
  Uraninite. 
  

  

  sulphates 
  are 
  insoluble 
  in 
  potassium 
  sulphate 
  other 
  than 
  those 
  

   of 
  Th, 
  Zr, 
  and 
  Ce 
  is 
  present* 
  A 
  very 
  satisfactory 
  turmeric 
  

   paper 
  reaction 
  for 
  zirconia 
  was 
  obtained 
  in 
  this 
  analysis 
  as 
  also 
  

   in 
  that 
  next 
  following, 
  which 
  would 
  go 
  to 
  show 
  that 
  the 
  hypo- 
  

   thetical 
  Zr0 
  2 
  of 
  several 
  of 
  my 
  earlier 
  analyses 
  was 
  probably 
  in 
  

   fact 
  zirconia. 
  The 
  cause 
  of 
  the 
  considerable 
  loss 
  shown 
  by 
  the 
  

   analysis 
  is 
  not 
  known. 
  It 
  may 
  be 
  mentioned 
  that 
  nivenite 
  is 
  

   more 
  soluble 
  than 
  any 
  uraninite 
  heretofore 
  examined 
  by 
  me, 
  

   not 
  even 
  excepting 
  cleveite. 
  One 
  hour 
  sufficed 
  for 
  complete 
  

   decomposition 
  in 
  very 
  dilute 
  sulphuric 
  acid 
  (1H 
  2 
  S0 
  4 
  to 
  6H 
  2 
  0) 
  

   at 
  the 
  temperature 
  of 
  boiling 
  water. 
  

  

  No. 
  II 
  is 
  from 
  a 
  new 
  locality, 
  Marietta, 
  Greenville 
  Co., 
  

   South 
  Carolina, 
  and 
  the 
  total 
  amount 
  found, 
  a 
  few 
  small 
  frag- 
  

   ments, 
  was 
  kindly 
  given 
  by 
  Mr. 
  W. 
  E. 
  Hidden 
  for 
  examina- 
  

   tion. 
  It 
  was 
  impossible 
  to 
  free 
  the 
  least 
  altered 
  portions 
  from 
  

   the 
  yellow 
  and 
  orange 
  alteration 
  products 
  with 
  which 
  they 
  

   were 
  intimately 
  commingled, 
  therefore 
  the 
  analysis 
  represents 
  

   the 
  composition 
  of 
  a 
  mixture. 
  Unfortunately 
  also 
  the 
  portion 
  

   in 
  which 
  U0 
  2 
  and 
  N 
  were 
  to 
  be 
  estimated 
  was 
  lost, 
  but 
  it 
  was 
  

   seen 
  that 
  the 
  mineral 
  was 
  very 
  soluble 
  and 
  gave 
  oft 
  consider- 
  

   able 
  gas. 
  From 
  the 
  preponderance 
  of 
  the 
  yttrium 
  group 
  over 
  

   the 
  other 
  rare 
  earths 
  the 
  mineral 
  is 
  to 
  be 
  classed 
  with 
  nivenite 
  

   and 
  cleveite 
  rather 
  than 
  with 
  those 
  varieties 
  rich 
  in 
  thoria, 
  a 
  

   a 
  conclusion 
  already 
  foreshadowed 
  by 
  its 
  ready 
  solubility. 
  

  

  No. 
  Ill 
  is 
  an 
  analysis 
  of 
  uraninite 
  from 
  the 
  Yilleneuve 
  mica 
  

   mine, 
  Township 
  of 
  Yilleneuve, 
  Ottawa 
  County, 
  Province 
  of 
  

   Quebec, 
  Canada. 
  To 
  Mr. 
  G. 
  C. 
  Hoffmann, 
  of 
  the 
  Canadian 
  

   Geological 
  Survey, 
  who 
  first 
  recognized 
  and 
  reported 
  this 
  occur- 
  

   rence^ 
  I 
  am 
  indebted, 
  for 
  the 
  material 
  analyzed. 
  It 
  was 
  

   evidently 
  somewhat 
  altered 
  and 
  was 
  accompanied 
  by 
  oxidized 
  

   alteration 
  products. 
  Hoffmann 
  gives 
  the 
  density 
  of 
  a 
  piece 
  as 
  

   9*055. 
  Crystalline 
  form 
  was 
  lacking, 
  but 
  it 
  unquestionably 
  

   belongs 
  to 
  the 
  crystallized 
  uraninites, 
  being 
  found 
  like 
  most 
  if 
  

   not 
  all 
  of 
  them 
  in 
  coarse 
  granite 
  (pegmatite). 
  

  

  No. 
  IY 
  represents 
  the 
  composition 
  of 
  a 
  specimen 
  from 
  

   Johanngeorgenstadt 
  in 
  Saxony, 
  received 
  from 
  Mr. 
  A. 
  Losch, 
  

   of 
  St. 
  Petersburg, 
  through 
  Mr. 
  E. 
  A. 
  Schneider 
  of 
  the 
  U. 
  S. 
  

   Geological 
  Survey. 
  Notwithstanding 
  the 
  altered 
  and 
  crumb- 
  

   ling 
  character 
  of 
  the 
  specimen 
  it 
  is 
  proper 
  to 
  publish 
  the 
  

   analysis, 
  since 
  the 
  only 
  one 
  previously 
  made 
  that 
  has 
  come 
  

   under 
  my 
  observation, 
  by 
  Pfaff 
  in 
  1822, 
  is 
  very 
  incomplete. 
  

   By 
  panning, 
  a 
  very 
  fair 
  article 
  as 
  regards 
  visible 
  impurity 
  was 
  

  

  * 
  It 
  may 
  be 
  here 
  remarked 
  that 
  the 
  subdivision 
  of 
  the 
  earths 
  into 
  the 
  groups 
  

   indicated 
  by 
  (La,Di) 
  2 
  3 
  and 
  (Y, 
  Er) 
  2 
  3 
  in 
  all 
  my 
  former 
  analyses 
  should 
  not 
  be 
  

   taken 
  too 
  literally. 
  By 
  the 
  former 
  is 
  meant 
  those 
  earths 
  insoluble 
  in 
  potassium 
  

   sulphate 
  and 
  by 
  the 
  latter 
  those 
  soluble 
  in 
  that 
  reagent. 
  

  

  f 
  Annual 
  Report 
  Can. 
  Geol. 
  Sur., 
  vol. 
  ii, 
  1886. 
  Report 
  T, 
  p. 
  10. 
  

  

  