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  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Pilfershire 
  pits, 
  57, 
  68, 
  71. 
  

  

  Plagioclase, 
  found 
  in 
  anorthosites, 
  

   147; 
  gabbros, 
  17, 
  62, 
  63; 
  gneisses, 
  

   15, 
  45, 
  50, 
  7i, 
  9i, 
  92, 
  109, 
  161, 
  169; 
  

   granites, 
  127; 
  magnetites, 
  152; 
  peg- 
  

   matite, 
  114; 
  schists, 
  m; 
  syenites, 
  

  

  65, 
  93- 
  

  

  Plattsburg, 
  furnace, 
  106. 
  

  

  Podunk 
  mine, 
  37-38. 
  

  

  Porphyritic 
  feldspar, 
  140. 
  

  

  Porphyritic 
  gneisses, 
  16. 
  

  

  Porphyry, 
  syenites, 
  19. 
  

  

  Port 
  Henry, 
  furnace 
  at, 
  7. 
  

  

  Port 
  Henry 
  group, 
  57~88. 
  

  

  Port 
  Henry 
  Iron 
  Ore 
  Co., 
  57, 
  86. 
  

  

  Port 
  Leyden 
  mines, 
  147, 
  148, 
  168-69. 
  

  

  Potash 
  feldspars, 
  Port 
  Leyden 
  ore 
  

   body, 
  148. 
  

  

  Potsdam 
  sandstone, 
  11, 
  19, 
  61, 
  108, 
  

   125. 
  

  

  Potter, 
  S. 
  R., 
  mentioned, 
  38, 
  39. 
  

  

  Potter 
  mine, 
  37-38 
  ; 
  cross-section, 
  37. 
  

  

  Precambric 
  rocks, 
  11. 
  

  

  Putnam, 
  B. 
  T., 
  cited, 
  35, 
  37, 
  40, 
  50, 
  

   54, 
  61, 
  68, 
  71, 
  97, 
  116, 
  121, 
  127, 
  128, 
  

   138, 
  172. 
  

  

  Putnam 
  county, 
  Tilly 
  Foster 
  mine, 
  

   72. 
  

  

  Pyrite, 
  9; 
  found 
  in 
  amphibolites, 
  14; 
  

   gneisses, 
  13, 
  27, 
  30, 
  32, 
  42, 
  45, 
  46, 
  

   89, 
  92, 
  131; 
  granites, 
  30; 
  lime- 
  

   stones, 
  13; 
  magnetites, 
  25, 
  30, 
  38, 
  

   39, 
  40, 
  41, 
  90, 
  96, 
  114, 
  135, 
  139, 
  140, 
  

   145, 
  152, 
  162, 
  163, 
  164; 
  quartzites, 
  

   14; 
  schists, 
  37, 
  46, 
  91, 
  138. 
  

  

  Pyroxene, 
  found 
  in 
  anorthosites, 
  158; 
  

   gabbros, 
  17; 
  gneisses, 
  15, 
  20, 
  71, 
  

   89, 
  131, 
  132, 
  143; 
  limestones, 
  13, 
  

   46; 
  magnetites, 
  24, 
  145, 
  152, 
  162, 
  

   163; 
  schists, 
  15, 
  20. 
  

  

  Pyrrhotite, 
  25, 
  96, 
  140. 
  

  

  Quartz, 
  analyses, 
  29 
  ; 
  found 
  in 
  

   gneisses, 
  13, 
  15, 
  27, 
  45, 
  46, 
  48, 
  89, 
  

   91, 
  92, 
  95, 
  103,. 
  109, 
  no, 
  115, 
  125, 
  

   132, 
  143, 
  144, 
  148, 
  169; 
  granites, 
  18, 
  

   28, 
  37, 
  41, 
  46, 
  112, 
  126, 
  127; 
  hema- 
  

   tite, 
  43; 
  magnetites, 
  24, 
  32, 
  53, 
  55, 
  

   96, 
  ioo, 
  101, 
  104, 
  113, 
  122, 
  135, 
  140, 
  

  

  145, 
  152; 
  pegmatite, 
  114; 
  schists, 
  

   37, 
  46, 
  67; 
  syenites, 
  18, 
  28, 
  64, 
  65, 
  

   93. 
  

   Quartzite, 
  14-15, 
  40. 
  

  

  Rand 
  hill, 
  17, 
  109. 
  

   Red 
  ore, 
  66, 
  80. 
  

   Redford, 
  forge, 
  124. 
  

   Rock 
  pond, 
  quartzite, 
  14. 
  

   Rogers, 
  J. 
  & 
  J. 
  Co., 
  100, 
  102. 
  

   Rossi, 
  cited, 
  146, 
  155, 
  156, 
  163; 
  men- 
  

   tioned, 
  153. 
  

   Russia, 
  forge, 
  106, 
  124. 
  

   Rutgers 
  pit, 
  90, 
  103. 
  

  

  St 
  Lawrence 
  county, 
  8; 
  field 
  work 
  

   in, 
  11; 
  gneisses, 
  14; 
  Grenville 
  

   series, 
  29; 
  limestones 
  and 
  schists, 
  

   13 
  ; 
  magnetites, 
  23, 
  25, 
  26 
  ; 
  mag- 
  

   netite 
  deposits, 
  map, 
  129; 
  mines, 
  

   128-45; 
  quartzites, 
  14, 
  15; 
  statistics 
  

   of 
  ore 
  production, 
  35. 
  

  

  Salisbury, 
  augite-syenite, 
  28; 
  mine, 
  

   23, 
  142-45. 
  

  

  Salisbury 
  Steel 
  & 
  Iron 
  Co., 
  144, 
  145. 
  

  

  Sanford 
  ores, 
  see 
  Lake 
  Sanford 
  ores. 
  

  

  Sanford 
  pit, 
  Mineville 
  group, 
  74. 
  

  

  Santanoni 
  mountain, 
  anorthosite, 
  

  

  157. 
  

  

  Saranac, 
  forge, 
  124; 
  mine, 
  124, 
  126, 
  

   128. 
  

  

  Saranac 
  formation, 
  15, 
  27, 
  91, 
  109, 
  

   124. 
  

  

  Saranac 
  valley, 
  mines 
  in, 
  124-28; 
  

   statistics 
  of 
  ore 
  production, 
  35. 
  

  

  Saratoga 
  county, 
  8. 
  

  

  Scapolite, 
  found 
  in 
  gneisses, 
  30, 
  132; 
  

   limestones, 
  13; 
  pegmatite, 
  114; 
  

   schists, 
  in. 
  

  

  Schists, 
  11, 
  13, 
  15, 
  27, 
  28, 
  29, 
  30; 
  

   Arnold 
  hill 
  and 
  Palmer 
  hill, 
  91; 
  

   Crown 
  Point 
  mines, 
  40; 
  foliation, 
  

   20; 
  mines 
  near 
  Fort 
  Ann, 
  37, 
  39; 
  

   Hammondville 
  mines, 
  45, 
  46, 
  48, 
  

   50; 
  Lake 
  Sanford 
  deposits, 
  157; 
  

   Lyon 
  Mountain 
  mines, 
  in, 
  113, 
  

   122; 
  Minerva 
  mine, 
  89; 
  Mineville- 
  

   Port 
  Henry 
  group, 
  62, 
  67; 
  St 
  

   Lawrence 
  county 
  mines, 
  130, 
  138, 
  

  

  