﻿32 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Chemical 
  composition, 
  norm, 
  and 
  mode 
  

  

  Excellent 
  exposures 
  of 
  what 
  is 
  regarded 
  as 
  very 
  typical 
  gabbro 
  

   occur 
  in 
  the 
  railroad 
  cut 
  i 
  1 
  /^ 
  miles 
  south 
  of 
  The 
  Glen. 
  This 
  rock 
  

   has 
  been 
  analyzed 
  for 
  the 
  writer 
  by 
  Prof. 
  E. 
  W. 
  Morley. 
  

  

  Table 
  5 
  

   Chemical 
  composition 
  and 
  norm 
  

  

  

  

  'o 
  

  

  2 
  

  

  H 
  

  

  < 
  

  

  O 
  

  

  

  

  

  < 
  

  

  

  

  

  

  5 
  

  

  0. 
  

  

  O 
  

  

  Si0 
  2 
  

  

  46 
  /to 
  

  

  ■773 
  

   •139 
  

   .013 
  

   .182 
  

   .124 
  

   .172 
  

   .050 
  

   .012 
  

  

  

  

  

  

  72 
  

  

  12 
  

  

  258 
  

  

  43 
  

  

  168 
  

  

  84 
  

  

  

  152 
  

  

  69 
  

  

  54 
  

  

  AI2O3../. 
  

  

  14 
  

  

  2 
  

   13 
  

  

  4 
  

   9 
  

   3 
  

   1 
  

  

  3 
  

  

  17 
  

  

  03 
  

   12 
  

  

  94 
  

  

  65 
  

  

  12 
  

  

  02 
  

   25 
  

   03 
  

  

  80 
  

  

  15 
  

   44 
  

   14 
  

  

  18 
  

   10 
  

   04 
  

  

  0=; 
  

  

  

  

  

  

  Fe 
  2 
  3 
  . 
  

  

  

  

  

  

  13 
  

   13 
  

  

  

  

  

  FeO 
  

  

  38 
  

  

  

  

  2 
  

  

  

  

  

  } 
  * 
  

  

  68 
  

  

  69 
  

  

  

  MgO 
  

  

  CaO 
  

  

  

  

  

  108 
  

  

  

  20 
  

  

  

  

  

  

  84 
  

  

  

  

  Na 
  2 
  

  

  7 
  

  

  

  12 
  

  

  43 
  

  

  

  

  K,0 
  

  

  

  

  

  

  

  H 
  2 
  + 
  

  

  

  

  

  

  

  

  

  

  

  

  H 
  2 
  0— 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  TiO,. 
  

  

  .038 
  

   .006 
  

   .004 
  

   .006 
  

   .005 
  

   .001 
  

   .001 
  

   .002 
  

   .000 
  

  

  38 
  

  

  

  

  

  

  

  

  

  

  

  

  PiO» 
  . 
  

  

  6 
  

  

  

  

  

  

  

  

  

  

  

  CI 
  

  

  15 
  

  

  

  

  

  

  

  

  

  

  MnO 
  

  

  

  

  

  

  6 
  

  

  

  

  S 
  

  

  

  

  

  5 
  

  

  

  

  

  

  

  

  BaO 
  

  

  

  

  

  

  

  

  

  1 
  

  

  

  

  SrO.. 
  . 
  . 
  

  

  

  

  

  

  

  

  

  

  

  

  F 
  

  

  

  

  

  

  

  

  

  

  

  

  ZrO* 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  99-77 
  

  

  

  Orth... 
  . 
  

  

  Alb 
  

  

  Anor 
  23 
  

  

  NaCl, 
  

  

  Ilm 
  

  

  Mag 
  

  

  Pyr 
  

  

  Apat 
  

  

  Diop 
  

  

  Hyper. 
  . 
  . 
  . 
  

  

  Oliv 
  

  

  H 
  2 
  0+Zr0 
  2 
  

  

  6.67 
  

  

  22.53 
  

  

  35 
  

  

  82 
  

   5-78 
  

   3.02 
  

  

  •24 
  

   2.02 
  

  

  17-53 
  

   8.02 
  

  

  9-32 
  

  

  .32 
  J 
  

  

  99.62 
  

  

  Sal.= 
  53-37 
  Class, 
  

  

  Sal. 
  

   Fern. 
  

  

  5337 
  < 
  5 
  > 
  3 
  

  

  Order, 
  p 
  

  

  45-93 
  3 
  5 
  

  

  82 
  T 
  

  

  — 
  — 
  - 
  <— 
  =5, 
  Gallare 
  

  

  52.55 
  7 
  

  

  III, 
  Salfemane 
  

  

  Fem.= 
  45.93 
  Rang, 
  

  

  KsO+NaaO 
  

  

  Subrang, 
  

  

  CaO 
  1 
  

  

  Na 
  2 
  O 
  l 
  

  

  84 
  3 
  > 
  5 
  

  

  3, 
  Camptonase 
  

  

  12 
  3 
  1 
  

   — 
  <— 
  >— 
  = 
  4, 
  Camptonose 
  

  

  50 
  5 
  7 
  

  

  