﻿SS 
  [SENAfr. 
  

  

  d. 
  Iron 
  ore 
  deposited 
  in 
  strings 
  and 
  masses 
  through 
  the 
  rock. 
  

  

  e. 
  Red 
  and 
  coarsely 
  crystalline 
  limestone. 
  

  

  47. 
  Specular 
  iron 
  ore, 
  of 
  a 
  soft 
  sectile 
  texture, 
  like 
  red 
  chalky 
  

   from 
  the 
  farm 
  of 
  James 
  Morse, 
  Governeurj 
  St. 
  Lawrence 
  

   county. 
  

  

  This 
  place 
  has 
  also 
  been 
  recently 
  wrought 
  for 
  iron 
  ore, 
  and 
  

   several 
  tons 
  of 
  a 
  quality 
  like 
  this, 
  and 
  No. 
  48, 
  (more 
  silicious 
  and 
  

   gritty) 
  have 
  been 
  procured. 
  It 
  is 
  in 
  and 
  under 
  Potsdam 
  sand- 
  

   stone, 
  and 
  appears 
  to 
  exist 
  abundantly. 
  The 
  sandstone 
  of 
  *this' 
  

   vicinity 
  is 
  in 
  many 
  places 
  highly 
  colored 
  with 
  iron, 
  which 
  ren- 
  

   ders 
  it 
  harder 
  and 
  less 
  liable 
  to 
  decay 
  upon 
  exposure. 
  The 
  sur- 
  

   faces 
  of 
  the 
  rock 
  appear 
  every 
  where 
  studded 
  with 
  projecting 
  

   masses 
  of 
  this 
  ferruginous 
  mixture. 
  No. 
  49 
  represents 
  one 
  of 
  these 
  

   masses. 
  

  

  In 
  the 
  immediate 
  vicinity 
  of 
  this 
  locality, 
  and 
  in 
  the 
  same 
  

   field, 
  is 
  a 
  deposite 
  of 
  Scaly 
  iron 
  froth, 
  (No. 
  50.) 
  of 
  an 
  extremely 
  

   unctuous 
  character, 
  and 
  dark 
  red 
  color. 
  It 
  possesses 
  but 
  slight 
  

   cohesive 
  properties, 
  and 
  has 
  been 
  used 
  with 
  great 
  advantage 
  in 
  

   diminishing 
  the 
  friction 
  of 
  wagon 
  wheels 
  and 
  heavy 
  machinery. 
  

   It 
  may 
  be 
  used 
  successfully 
  in 
  sharpening 
  razors, 
  polishing 
  cut- 
  

   lery, 
  imparting 
  a 
  metallic 
  coat 
  for 
  electrotype 
  purposes, 
  and 
  for 
  

   all 
  other 
  uses 
  to 
  which 
  plumbago 
  is 
  applied, 
  except 
  where 
  the 
  

   color 
  would 
  be 
  an 
  objection. 
  

  

  It 
  occurs 
  in 
  white 
  limestone 
  and 
  apparently 
  in 
  large 
  quantities, 
  

   associated 
  with 
  the 
  following 
  : 
  

  

  51, 
  52. 
  Sulphate 
  of 
  barytes. 
  Of 
  a 
  highly 
  crystalline 
  and 
  

   cleavable 
  variety. 
  

  

  The 
  color 
  is 
  snow 
  white 
  when 
  not 
  stained 
  by 
  the 
  iron 
  ; 
  in 
  some 
  

   cases 
  it 
  is 
  nearly 
  transparent, 
  and 
  in 
  others 
  it 
  is 
  filled 
  with 
  angu- 
  

   lar 
  cavities 
  from 
  the 
  high 
  crystalline 
  development 
  which 
  it 
  

   exhibits. 
  

  

  The 
  edges 
  of 
  the 
  plates 
  which 
  form 
  the 
  cavities 
  do 
  not 
  often 
  

   present 
  crystalline 
  planes, 
  yet 
  several 
  have 
  been 
  observed 
  which 
  

   besides 
  the 
  more 
  common 
  forms 
  represent 
  the 
  modifications 
  

   represented 
  in 
  the 
  following 
  figures 
  : 
  (11, 
  and 
  12.) 
  

  

  