﻿W. 
  F. 
  llillebrand 
  — 
  Analyses 
  of 
  Uraninite. 
  391 
  

  

  considerable 
  work 
  has 
  been 
  done 
  in 
  certain 
  directions, 
  some 
  of 
  

   which 
  is 
  of 
  sufficient 
  interest 
  to 
  be 
  produced 
  later 
  in 
  a 
  separate 
  

   publication. 
  In 
  addition 
  several 
  analyses 
  of 
  uraninite 
  have 
  

   been 
  made, 
  the 
  material 
  being 
  in 
  part 
  from 
  localities 
  hitherto 
  

   unrepresented 
  by 
  analytical 
  data, 
  and 
  these 
  form 
  the 
  subject 
  

   of 
  the 
  present 
  paper. 
  

  

  A 
  first 
  glance 
  sufficed 
  to 
  show 
  that 
  the 
  specimens 
  were 
  not 
  

   fresh 
  and 
  that 
  therefore 
  analysis 
  could 
  throw 
  no 
  light 
  on 
  the 
  

   ultimate 
  composition 
  of 
  the 
  mineral, 
  but 
  valuable 
  data 
  to 
  be 
  

   obtained 
  as 
  to 
  the 
  presence 
  or 
  absence 
  of 
  nitrogen 
  and 
  of 
  the 
  

   rare 
  earths 
  furnished 
  ample 
  excuse 
  for 
  the 
  work. 
  

  

  

  i 
  

  

  

  

  II. 
  

  

  in. 
  

  

  IV. 
  

  

  

  Llano 
  Co., 
  Texas. 
  

  

  

  

  Ville- 
  

  

  Johann- 
  

  

  

  a. 
  

  

  b. 
  

  

  

  Marietta 
  

  

  neuve 
  P. 
  

  

  georgen- 
  

  

  

  

  Hidden 
  and 
  

  

  

  South 
  

  

  Quebec, 
  

  

  stadt, 
  

  

  

  Hillebrand 
  

  

  Mackintosh. 
  

  

  < 
  

  

  Carolina. 
  

  

  Canada. 
  

  

  Saxony. 
  

  

  uo, 
  

  

  44-17 
  

  

  46-75 
  

  

  \ 
  

  

  83 
  95 
  5 
  

  

  41-06 
  

  

  59-30 
  

  

  uo 
  2 
  

  

  20-89 
  

  

  19-89 
  

  

  34-67 
  

  

  22-33 
  

  

  Th0 
  3 
  

  

  6-69 
  

  

  7-57 
  

  

  

  1-65 
  

  

  6-41 
  1 
  

  

  

  Zr0 
  2 
  

  

  0-34 
  

  

  

  

  0-20 
  

  

  ? 
  1 
  

  

  

  Ce0 
  2 
  

  

  0-34 
  

  

  

  

  0-19 
  

  

  •4o 
  y 
  

  

  none. 
  

  

  La 
  group. 
  

  

  236 
  

  

  

  

  2-05 
  

  

  i-ii 
  | 
  

  

  

  Y 
  group. 
  

  

  9-46 
  1 
  

  

  11-22 
  4 
  

  

  

  6-16 
  6 
  

  

  2-57 
  7 
  J 
  

  

  

  CaO 
  

  

  0-32 
  

  

  

  

  0-41 
  

  

  •39 
  

  

  100 
  

  

  PbO 
  

  

  10-08 
  

  

  10-16 
  

  

  

  358 
  

  

  11-27 
  

  

  . 
  639 
  

  

  H 
  2 
  

  

  1-48 
  

  

  2-54(ign.) 
  

  

  

  undet. 
  

  

  1-47 
  

  

  3-17 
  

  

  N 
  

  

  0-54 
  

  

  

  

  " 
  

  

  0-86 
  

  

  0-02 
  

  

  Si0 
  2 
  

  

  0-46 
  2 
  

  

  

  1 
  

  

  0-20 
  

  

  0-19 
  

  

  0-50 
  

  

  Insol. 
  

  

  1-473 
  

  

  1'22 
  

  

  0-13 
  

  

  

  Fe 
  2 
  3 
  

  

  0-14 
  

  

  0-58 
  

  

  

  tr. 
  

  

  o-io 
  

  

  0-21 
  

  

  X 
  

  

  

  

  

  tr* 
  

  

  0-09 
  9 
  

  

  5-03 
  1( 
  

  

  

  98-74 
  

  

  9993 
  

  

  

  98-39 
  

  

  100-72 
  

  

  97-95 
  

  

  Sp.G. 
  

  

  8'29 
  

  

  8-01 
  

  

  

  

  

  6-89 
  

  

  i 
  At. 
  wght. 
  111*4. 
  2 
  From 
  thorog-ummite. 
  s 
  Mainly 
  fergusonite. 
  4 
  At. 
  wght. 
  1242. 
  

   .s 
  As 
  IT 
  3 
  8 
  . 
  6 
  Atomic 
  weight 
  113 
  - 
  6. 
  The 
  oxalates 
  of 
  this 
  group 
  were 
  white, 
  not 
  pink 
  

   like 
  those 
  in 
  la, 
  but 
  the 
  color 
  of 
  the 
  ignited 
  oxides 
  was 
  the 
  same 
  in 
  both 
  cases 
  and 
  

   very 
  light. 
  "Atomic 
  weight 
  111-2 
  approximately. 
  8MgO,Na„0. 
  9]Bi 
  2 
  3 
  . 
  io 
  Includes: 
  

   A1 
  2 
  3 
  (?) 
  0-20, 
  Bio0 
  3 
  0-75, 
  CuO 
  0-17, 
  MnO 
  0-09, 
  MgO 
  017, 
  Na 
  2 
  0-31, 
  P 
  2 
  5 
  0'06, 
  As 
  2 
  5 
  2-34, 
  

   V 
  2 
  05, 
  W0 
  3 
  , 
  Mo0 
  3 
  (?) 
  0-75, 
  S0 
  3 
  0-19=5-03. 
  

  

  No. 
  la 
  is 
  a 
  re-analysis 
  of 
  nivenite 
  from 
  Llano 
  County, 
  Texas, 
  

   the 
  material 
  for 
  which 
  was 
  kindly 
  given 
  by 
  Mr. 
  TV 
  . 
  E. 
  Hidden. 
  

   It 
  agrees 
  in 
  the 
  main 
  with 
  the 
  original 
  analysis 
  of 
  this 
  variety 
  

   by 
  Hidden 
  and 
  Mackintosh,* 
  which 
  is 
  reproduced 
  under 
  lb, 
  

   and 
  it 
  confirms 
  the 
  presence 
  of 
  nitrogen, 
  suspected 
  but 
  not 
  

   proven 
  by 
  them. 
  A 
  small 
  remnant 
  of 
  their 
  original 
  powdered 
  

   sample 
  gave 
  me 
  0*52 
  per 
  cent 
  of 
  nitrogen. 
  In 
  a 
  the 
  earths 
  

   appear 
  in 
  slightly 
  greater 
  total 
  amount 
  than 
  in 
  b 
  and 
  they 
  are 
  

   more 
  subdivided 
  into 
  groups 
  and 
  elements, 
  which 
  accounts 
  

   fully 
  for 
  the 
  difference 
  between 
  the 
  atomic 
  weights 
  of 
  the 
  

   metals 
  of 
  the 
  yttrium 
  group 
  of 
  the 
  two 
  analyses. 
  It 
  was 
  

   rendered 
  certain 
  by 
  a 
  second 
  test 
  that 
  a 
  group 
  of 
  earths 
  whose 
  

  

  *This 
  Journ., 
  Ill, 
  xxxviii, 
  1889, 
  p. 
  481. 
  

  

  Am. 
  Jour. 
  Sci. 
  — 
  Third 
  Series, 
  Vol. 
  XLII, 
  No. 
  251. 
  — 
  November, 
  1891. 
  

   27 
  

  

  