﻿GEOLOGY 
  OF 
  SARATOGA 
  SPRINGS 
  AND 
  VICINITY 
  I29 
  

  

  The 
  water 
  is 
  no 
  doubt 
  present 
  as 
  a 
  constituent 
  of 
  the 
  glass. 
  The 
  

   interest 
  attaching 
  to 
  the 
  presence 
  of 
  carbon 
  more 
  than 
  compensates 
  

   for 
  the 
  slight 
  uncertainty 
  introduced 
  into 
  the 
  analysis. 
  

  

  Si0 
  2 
  

  

  47-55 
  

  

  A1 
  2 
  3 
  

  

  16.65 
  

  

  Fe 
  2 
  Oa 
  

  

  4.94 
  

  

  FeO 
  

  

  5.12 
  

  

  MgO 
  

  

  5-63 
  

  

  CaO 
  

  

  477 
  

  

  Na 
  2 
  

  

  4.20 
  

  

  K.0 
  

  

  2.52 
  

  

  H 
  2 
  0+ 
  

  

  5-57 
  

  

  H 
  2 
  0— 
  

  

  0.24 
  

  

  Ti0 
  2 
  

  

  0.87 
  

  

  P 
  2 
  6 
  

  

  0.27 
  

  

  CI 
  

  

  O.IO 
  

  

  F 
  

  

  0.06 
  

  

  S 
  

  

  0.0 
  1 
  

  

  MnO 
  

  

  0.46 
  

  

  C 
  

  

  0.80 
  

  

  CaCOs 
  

  

  0-34 
  

  

  Total 
  100.10 
  

  

  Selected 
  rock 
  from 
  the 
  center 
  of 
  one 
  of 
  the 
  large 
  lava 
  balls, 
  as 
  free 
  as 
  

   possible 
  from 
  calcite. 
  E. 
  W. 
  Morley, 
  analyst. 
  

  

  The 
  calculated 
  norm 
  of 
  the 
  rock 
  would 
  be 
  

  

  Orthoclase 
  

  

  I5-OI 
  

  

  Olivine 
  

  

  12.64 
  

  

  Albite 
  

  

  33-01 
  

  

  Magnetite 
  

  

  7.19 
  

  

  Anorthite 
  

  

  18.90 
  

  

  Ilmenite 
  

  

  1.67 
  

  

  Nepheline 
  

  

  1.42 
  

  

  Apatite 
  

  

  0.67 
  

  

  Diopside 
  

  

  2.48 
  

  

  

  

  Totalling 
  92.99 
  per 
  cent; 
  the 
  residue 
  consisting 
  of 
  water, 
  carbon 
  

   and 
  calcium 
  carbonate. 
  The 
  rock 
  classifies 
  in 
  

  

  Class 
  2, 
  Dosalane 
  Rang 
  3, 
  Andase 
  

  

  Order 
  5, 
  Germanare 
  Subrang 
  4, 
  Andose. 
  

  

  It 
  is 
  thus 
  a 
  member 
  of 
  a 
  very 
  large 
  rock 
  group, 
  of 
  diabasic 
  or 
  

   basaltic 
  composition. 
  It 
  is 
  quite 
  near 
  some 
  of 
  the 
  Newark 
  traps, 
  

   that 
  from 
  Medford, 
  Mass., 
  analyzed 
  by 
  Merrill 
  for 
  example, 
  though 
  

   it 
  is 
  a 
  more 
  basic 
  rock 
  than 
  the 
  average 
  Newark 
  traps, 
  which 
  run 
  

   from 
  52 
  to 
  53 
  per 
  cent 
  of 
  silica. 
  

  

  