﻿CLAYS 
  OF 
  NEW 
  YORK 
  807 
  

  

  good 
  results 
  when 
  mixed 
  with, 
  other 
  clays 
  or 
  with 
  artificial 
  fluxes. 
  

   Analyses 
  of 
  this 
  material 
  are 
  given 
  beyond. 
  

  

  The 
  following 
  analyses 
  made 
  by 
  the 
  Missouri 
  geological 
  survey 
  

   gives 
  the 
  composition 
  of 
  the 
  clay. 
  

  

  Silica 
  56.75 
  

  

  Alumina 
  15 
  . 
  47 
  

  

  Combined 
  water 
  *. 
  8.87 
  

  

  Moisture 
  .37 
  

  

  Protoxid 
  of 
  iron 
  5.73 
  

  

  Protoxid 
  of 
  manganese 
  tr 
  . 
  

  

  Lime 
  5 
  . 
  78 
  

  

  Magnesia 
  3.32 
  

  

  'Alkalis 
  3.25 
  

  

  Total 
  99.54 
  

  

  Another 
  analysis 
  made 
  by 
  H. 
  H. 
  Griffen 
  (Clay 
  ivorher,. 
  28: 
  

   178) 
  gives: 
  

  

  Silica 
  17.02 
  

  

  Alumina 
  , 
  14.80 
  

  

  Ferric 
  oxid 
  ^. 
  5 
  . 
  85 
  

  

  Manganic 
  oxid 
  .14 
  

  

  Lime 
  5.70 
  

  

  Magnesia 
  2 
  . 
  48 
  

  

  Potash 
  3.23 
  

  

  Soda 
  1.07 
  

  

  Phosphoric 
  acid 
  .15 
  

  

  Water 
  5.18 
  

  

  Moisture 
  and 
  carbonic 
  acid 
  4. 
  94 
  

  

  Sand 
  , 
  , 
  38.58 
  

  

  Total 
  99 
  . 
  14 
  

  

  Tests 
  made 
  by 
  the 
  Missouri 
  geological 
  survey 
  showed 
  that 
  this 
  

   clay 
  shrunk 
  6^ 
  when 
  air 
  dried- 
  and 
  8^ 
  when 
  vitrified, 
  gi\^ng 
  a 
  

  

  