﻿4:66 
  Luquer 
  and 
  Volckening 
  — 
  New 
  Analyses 
  of 
  Sodalite. 
  

  

  free 
  from 
  impurities 
  ; 
  and 
  its 
  color, 
  physical 
  characters 
  and 
  

   blowpipe 
  reactions 
  are 
  the 
  same 
  as 
  in 
  the 
  Canadian 
  sodalite. 
  

  

  A 
  thin 
  section 
  showed 
  the 
  presence 
  of 
  very 
  perfect 
  cleavage, 
  

   and 
  the 
  commencement 
  of 
  decomposition, 
  especially 
  along 
  the 
  

   cleavage 
  cracks. 
  Microlitic 
  inclusions 
  of 
  hornblende 
  and 
  a 
  

   few 
  grains 
  of 
  what 
  appeared 
  to 
  be 
  eleeolite 
  were 
  also 
  noticed. 
  

   Between 
  crossed 
  nicols 
  it 
  was 
  perfectly 
  isotropic. 
  Two 
  sides 
  

   of 
  the 
  specimen 
  were 
  polished. 
  

  

  Sodalite 
  from 
  the 
  Congo 
  State, 
  Africa. 
  

  

  The 
  specimen 
  examined 
  was 
  collected 
  by 
  Brazza, 
  the 
  ex- 
  

   plorer, 
  and, 
  so 
  far 
  as 
  is 
  known, 
  is 
  the 
  only 
  noted 
  occurrence 
  of 
  

   this 
  mineral 
  in 
  Africa. 
  The 
  cleavage 
  is 
  not 
  very 
  apparent 
  

   macroscopically, 
  but 
  its 
  color, 
  physical 
  characters 
  and 
  blowpipe 
  

   reactions 
  are 
  the 
  same 
  as 
  in 
  the 
  Canadian 
  sodalite. 
  A 
  decom- 
  

   posed 
  iron 
  mineral 
  (chiefly 
  limonite) 
  and 
  a 
  decomposed 
  feld- 
  

   spar 
  or 
  clay 
  are 
  associated 
  with 
  the 
  sodalite. 
  A 
  thin 
  section 
  

   showed 
  rather 
  a 
  more 
  advanced 
  state 
  of 
  decomposition 
  than 
  in 
  

   the 
  Ural 
  specimen, 
  and 
  the 
  presence 
  of 
  only 
  imperfect 
  cleavage. 
  

   Little 
  patches 
  of 
  oxide 
  of 
  iron 
  were 
  noticed, 
  and 
  between 
  

   crossed 
  nicols 
  the 
  section 
  was 
  completely 
  isotropic. 
  One 
  side 
  

   of 
  the 
  specimen 
  was 
  beautifully 
  polished. 
  

  

  The 
  specimens 
  from 
  the 
  Ural 
  Mountains 
  and 
  the 
  Congo 
  

   were 
  loaned 
  for 
  examination 
  by 
  Tiffany 
  & 
  Co., 
  through 
  the 
  

   courtesy 
  of 
  Mr. 
  G. 
  F. 
  Kunz 
  ; 
  but 
  unfortunately 
  no 
  details 
  

   could 
  be 
  obtained 
  as 
  to 
  exact 
  occurrence, 
  associated 
  minerals., 
  

   etc. 
  

  

  Ontario, 
  

  

  CI... 
  

   Si0 
  2 
  . 
  

   Na 
  n 
  O 
  

   AlO 
  

  

  Sp. 
  

  

  Gr. 
  2-303. 
  

   ._ 
  6-79 
  

   __ 
  37-34 
  

   .. 
  25-01 
  

   .. 
  31-25 
  

  

  Chemical 
  1 
  

   Urals, 
  Sp. 
  

  

  CI 
  

  

  Si0 
  ... 
  

   Na 
  2 
  0__ 
  

   AUV_ 
  

   CaO 
  . 
  . 
  _ 
  

   K 
  2 
  0... 
  

  

  LNALYSES. 
  

  

  Gr. 
  2-328. 
  

   ._ 
  6-65 
  

   .. 
  37-28 
  

   ._ 
  24-74 
  

   .. 
  31-60 
  

   •46 
  

   •93 
  

  

  Congo, 
  Sp. 
  Gr. 
  2-363. 
  

  

  CI 
  6-46 
  

  

  Si0 
  2 
  37'85 
  

  

  Na 
  2 
  ... 
  25-43 
  

   Al 
  2 
  O 
  s 
  _-_ 
  30-87 
  

  

  2 
  3 
  

  

  CaO. 
  

   K 
  2 
  0. 
  

  

  CI, 
  

  

  •38 
  

  

  •74 
  

  

  CaO 
  -51 
  

  

  K 
  2 
  0..-- 
  -22 
  

  

  Deduct 
  ox 
  

   lent 
  for 
  

  

  101-51 
  

   n 
  equiva- 
  

   1-53 
  

  

  101-66 
  

   1-50 
  

  

  101-34 
  

   1-46 
  

  

  E. 
  Bamberger 
  and 
  K. 
  Feussner 
  note 
  the 
  occurrence 
  o£ 
  

   sodalite 
  in 
  Tiahuanaco, 
  Bolivia. 
  Zeit. 
  f. 
  Kryst., 
  1881, 
  v, 
  580. 
  

  

  Mineral 
  ogical 
  Laboratory, 
  Columbia 
  College, 
  March 
  27th, 
  1894. 
  

  

  