﻿294 
  Larsen 
  and 
  Hunt 
  — 
  Vanadiferous 
  ^Egirites. 
  

  

  Table 
  II 
  

   SiO 
  

  

  '.. 
  Analyses 
  of 
  JEgirite 
  

  

  Doelter 
  

   51-74 
  

  

  Hunt 
  

   51-91 
  

  

  TiO 
  ... 
  

  

  

  •91 
  

  

  FeO 
  

  

  26-17 
  

  

  21-79 
  

  

  v.o,- 
  

  

  Al 
  

  

  -47 
  

  

  3-98* 
  

  

  •38 
  

  

  CaO 
  

  

  MgO... 
  

  

  FeO 
  

  

  5-07 
  

  

  1-79 
  

  

  3-48 
  

  

  5-53 
  

  

  3-08 
  

   1-48 
  

  

  MnO 
  

  

  Na 
  2 
  

  

  K 
  

  

  -46 
  

  

  .„ 
  11-02 
  

  

  -34 
  

  

  •58 
  

  

  10-46 
  

  

  •22 
  

  

  2 
  

  

  

  

  H.O- 
  

  

  H 
  2 
  + 
  

  

  S 
  

  

  co 
  2 
  

  

  100-54 
  

  

  •06 
  

   none 
  

  

  ♦13 
  

   trace 
  

  

  100-51 
  

  

  shown 
  in 
  column 
  3 
  there 
  remains 
  the 
  molecular 
  proportions 
  

   given 
  in 
  column 
  4, 
  which 
  closely 
  approximates 
  CaO.Mg0.2Si0 
  2 
  

  

  (diopside). 
  

  

  

  1 
  

  

  2 
  

  

  3 
  

  

  4 
  

  

  Si0 
  2 
  

  

  •8608 
  ) 
  

   •0113 
  j 
  

  

  •8721 
  

  

  •6840 
  

  

  

  Ti0 
  2 
  

  

  •1881 
  

  

  Fe 
  2 
  3 
  ... 
  

  

  •1364 
  ) 
  

  

  

  

  

  VO. 
  

  

  •0264 
  [• 
  

   •0037 
  ) 
  

  

  •1665 
  

  

  •1710 
  

  

  

  A1 
  2 
  3 
  

  

  

  CaO 
  

  

  •0986 
  

  

  •0986 
  

  

  

  •0986 
  

  

  MgO 
  

  

  0763 
  ) 
  

  

  

  

  

  FeO 
  

  

  0206 
  [ 
  

  

  •1050 
  

  

  

  •1050 
  

  

  MnO 
  

  

  0081 
  ) 
  

  

  

  

  

  Na 
  2 
  

  

  1687 
  ) 
  

   0023 
  \ 
  

  

  •1710 
  

  

  •1710 
  

  

  

  KO 
  

  

  

  These 
  figures 
  correspond 
  to 
  an 
  isomorphous 
  mixture 
  of 
  

   about 
  73 
  per 
  cent 
  of 
  segirite, 
  where 
  the 
  K 
  2 
  replaces 
  the 
  JNa 
  2 
  0. 
  

   Y 
  2 
  3 
  and 
  A1 
  2 
  3 
  the 
  Fe 
  2 
  3 
  , 
  Ti0 
  2 
  the 
  Si0 
  2 
  ; 
  and 
  27 
  per 
  cent 
  

   diopside, 
  where 
  the 
  MgO 
  is 
  replaced 
  in 
  part 
  by 
  FeO 
  and 
  MnO. 
  

   A 
  comparison 
  of 
  the 
  analysis 
  with 
  that 
  calculated 
  containing 
  

   73 
  per 
  cent 
  Na 
  2 
  Fe 
  2 
  Si 
  4 
  12 
  , 
  and 
  27 
  per 
  cent 
  CaMg(Si0 
  3 
  ) 
  2 
  shows 
  : 
  

  

  * 
  A 
  duplicate 
  sample 
  gave 
  3 
  "81 
  per 
  cent. 
  

  

  