﻿20 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  are 
  less 
  abundant 
  about 
  Saratoga 
  than 
  the 
  former. 
  They 
  are 
  often 
  

   somewhat 
  micaceous, 
  a 
  brown 
  phlogopite 
  being 
  the 
  usual 
  mica. 
  

   Pyrite 
  is 
  also 
  a 
  common 
  mineral, 
  and 
  the 
  pyritiferous 
  quartzites, 
  

   on 
  weathered 
  surface, 
  have 
  the 
  pyrite 
  weathered 
  out 
  and 
  replaced 
  

   by 
  a 
  brown 
  limonite 
  stain. 
  

  

  Much 
  of 
  the 
  quartzite 
  contains 
  graphite 
  sparingly. 
  There 
  is 
  a 
  

   thickness 
  of 
  at 
  least 
  ioo 
  feet 
  that 
  contains 
  it 
  in 
  sufficient 
  quantity 
  

   so 
  that 
  it 
  has 
  been 
  worked 
  for 
  graphite 
  at 
  two 
  different 
  localities 
  

   on 
  the 
  quadrangle, 
  I 
  mile 
  southwest 
  of 
  Kings 
  Station 
  and 
  2 
  miles 
  

   west 
  of 
  Porter 
  Corners. 
  The 
  rock 
  is 
  quite 
  similar 
  at 
  the 
  two 
  

   places, 
  being 
  granular 
  and 
  considerably 
  altered. 
  It 
  is 
  interbedded 
  

   with 
  quartzites 
  and 
  quartzose 
  mica 
  schists 
  and 
  is 
  itself 
  a 
  graphitic 
  

   quartz 
  schist. 
  At 
  the 
  Porter 
  Corners 
  locality 
  the 
  rock 
  is 
  a 
  quartz- 
  

   feldspar 
  combination, 
  about 
  50 
  per 
  cent 
  quartz, 
  40 
  per 
  cent 
  feld- 
  

   spar, 
  and 
  the 
  remainder 
  graphite 
  and 
  mica. 
  In 
  the 
  special 
  bed 
  

   worked 
  there 
  is 
  but 
  little 
  mica 
  and 
  nearly 
  10 
  per 
  cent 
  of 
  graphite. 
  

   Above 
  and 
  below 
  more 
  mica 
  comes 
  in. 
  The 
  feldspar 
  is 
  very 
  badly 
  

   altered. 
  

  

  At 
  the 
  Kings 
  Station 
  locality 
  the 
  rock 
  is 
  so 
  similar 
  as 
  strongly 
  

   to 
  suggest 
  the 
  identity 
  of 
  the 
  horizon. 
  On 
  first 
  appearance, 
  the 
  

   rock 
  seems 
  richer 
  in 
  graphite 
  than 
  at 
  Porter 
  Corners, 
  and 
  may 
  be 
  

   so 
  ; 
  but 
  it 
  certainly 
  contains 
  more 
  mica 
  than 
  that, 
  a 
  disadvantage 
  

   from 
  the 
  standpoint 
  of 
  successful 
  working. 
  The 
  rock 
  in 
  both 
  

   places 
  is 
  very 
  similar 
  to 
  that 
  which 
  has 
  been 
  worked 
  for 
  years 
  

   about 
  Hague; 
  and 
  though 
  it 
  is 
  quite 
  possible 
  that 
  there 
  may 
  be 
  

   more 
  than 
  one 
  horizon 
  of 
  such 
  graphitic 
  quartzite 
  in 
  the 
  Grenville, 
  

   it 
  seems 
  more 
  reasonable 
  to 
  assume 
  but 
  one, 
  in 
  default 
  of 
  definite 
  

   evidence 
  to 
  the 
  contrary. 
  

  

  Grenville 
  limestone. 
  But 
  two 
  beds 
  of 
  limestone 
  were 
  seen 
  in 
  

   the 
  Grenville 
  of 
  the 
  quadrangle, 
  one 
  noted 
  only 
  at 
  the 
  dam 
  of 
  the 
  

   Kings 
  Station 
  graphite 
  mill, 
  the 
  other 
  in 
  two 
  localities, 
  about 
  a 
  

   mile 
  apart 
  along 
  the 
  strike, 
  between 
  3 
  and 
  4 
  miles 
  west 
  of 
  north 
  

   of 
  Kings 
  Station. 
  Each 
  is 
  about 
  10 
  feet 
  thick, 
  impure, 
  and 
  closely 
  

   associated 
  with 
  heavy, 
  black 
  amphibolites, 
  which 
  are 
  very 
  common 
  

   border 
  rocks 
  to 
  the 
  limestones 
  in 
  the 
  Adirondacks 
  and 
  were 
  origi- 
  

   nally 
  very 
  impure 
  limestones. 
  

  

  The 
  limestone 
  of 
  these 
  two 
  beds 
  is 
  far 
  from 
  pure, 
  the 
  calcite 
  

   constituting 
  not 
  over 
  50 
  per 
  cent 
  of 
  the 
  rock. 
  The 
  most 
  common 
  

   of 
  the 
  other 
  constituents 
  is 
  quartz, 
  but 
  scapolite, 
  pyroxene, 
  phlogo- 
  

   pite, 
  graphite 
  and 
  titanite 
  are 
  also 
  present. 
  Much 
  of 
  the 
  rock 
  is 
  

   fine 
  grained 
  and 
  of 
  a 
  gray 
  tint, 
  instead 
  of 
  being 
  the 
  usual, 
  coarsely 
  

   crystalline, 
  white 
  marble 
  of 
  the 
  region. 
  

  

  