﻿90 
  TWENTY-FIRST 
  REPORT 
  ON 
  THE 
  STATE 
  CABINET. 
  

  

  mentioned 
  above, 
  a 
  massive 
  pyrites 
  is 
  the 
  gangue 
  both 
  of 
  crystals 
  

   of 
  apatite 
  and 
  of 
  magnetite. 
  The 
  pyrites 
  from 
  veins 
  in 
  the 
  LaiR 
  

   rentian 
  rocks 
  occasionally 
  contains 
  cobalt 
  and 
  nickel, 
  sometimes 
  in 
  

   large 
  proportions. 
  A 
  bronze 
  colored, 
  compact, 
  impalpable 
  vari- 
  

   ety, 
  found 
  in 
  irregular 
  reniform 
  or 
  globular 
  masses, 
  with 
  copper 
  

   pyrites, 
  in 
  North 
  Burgess, 
  gave 
  me 
  on 
  analysis 
  3.47 
  per 
  cent 
  of 
  

   cobalt 
  and 
  2.21 
  per 
  cent 
  of 
  nickel. 
  It 
  contained 
  no 
  arsenic. 
  

  

  It 
  would 
  seem 
  scarcely 
  necessary 
  to 
  mention 
  the 
  existence, 
  in 
  

   the 
  strata, 
  of 
  a 
  mineral 
  so 
  generally 
  diffused 
  as 
  pyrites, 
  were 
  it 
  

   not 
  for 
  two 
  reasons 
  : 
  first, 
  to 
  recall 
  that 
  pyrites 
  is 
  sometimes 
  dis- 
  

   seminated 
  in 
  the 
  beds 
  of 
  magnetic 
  oxyd, 
  so 
  as 
  to 
  render 
  the 
  roast- 
  

   ing 
  of 
  these, 
  to 
  remove 
  the 
  sulphur, 
  a 
  necessary 
  preliminary 
  to 
  

   the 
  smelting 
  process 
  : 
  and 
  second, 
  to 
  remark 
  that 
  the 
  bands 
  in 
  the 
  

   Laurentian 
  gneiss 
  are 
  sometimes 
  impregnated 
  with 
  pyrites 
  to 
  such 
  

   an 
  extent 
  that 
  their 
  weathered 
  surfaces 
  become 
  stained 
  of 
  a 
  red- 
  

   dish 
  hue 
  from 
  its 
  decomposition. 
  These 
  iron-stained 
  strata 
  consti- 
  

   tute 
  what 
  the 
  German 
  miners 
  call 
  fahlbands, 
  and 
  are 
  often 
  of 
  

   economic 
  interest, 
  from 
  containing 
  ores 
  of 
  more 
  precious 
  metals, 
  

   such 
  as 
  copper, 
  zinc, 
  cobalt, 
  nickel 
  or 
  even 
  gold 
  and 
  silver, 
  either 
  

   impregnating 
  certain 
  layers, 
  or 
  accumulated 
  in 
  veins, 
  which 
  inter- 
  

   sect 
  the 
  fahlband. 
  From 
  a 
  certain 
  similarity 
  in 
  their 
  chemical 
  

   relations 
  between 
  all 
  these 
  metals, 
  it 
  happens 
  that 
  their 
  sulphurets 
  

   are 
  very 
  commonly 
  associated 
  in 
  nature, 
  so 
  that 
  a 
  deposit 
  of 
  pyrites 
  

   is 
  not 
  unfrequently 
  impregnated 
  with 
  or 
  accompanied 
  by 
  the 
  sul- 
  

   phurets 
  of 
  more 
  valuable 
  metals. 
  

  

  Magnetic 
  Pyrites 
  is 
  occasionally 
  found 
  in 
  the 
  Laurentian 
  veins 
  

   under 
  conditions 
  similar 
  to 
  those 
  just 
  mentioned 
  for 
  cubic 
  pyrites. 
  

   Near 
  Portneuf, 
  Quebec, 
  a 
  veinstone 
  of 
  calcite 
  encloses 
  small 
  crys- 
  

   tals 
  of 
  green 
  p} 
  r 
  roxene, 
  together 
  with 
  considerable 
  masses 
  and 
  

   imperfect 
  crystals 
  of 
  magnetic 
  pyrites. 
  

  

  Copper 
  Pyrites. 
  — 
  This 
  ore 
  is 
  occasionally 
  found 
  with 
  the 
  Lau- 
  

   rentian 
  limestones 
  both 
  in 
  Canada 
  and 
  in 
  New 
  York 
  (Geol. 
  Can., 
  

   page 
  692). 
  In 
  some 
  cases 
  it 
  occurs 
  in 
  small 
  irregular 
  veins, 
  with 
  

   calcite, 
  and 
  occasionally 
  with 
  iron 
  pyrites 
  rich 
  in 
  cobalt 
  and 
  nick- 
  

   el, 
  but 
  unaccompanied 
  by 
  the 
  minerals 
  which 
  generally 
  charac- 
  

   terize 
  the 
  Laurentian 
  veinstones. 
  In 
  Escott, 
  Ontario, 
  however, 
  it 
  

   is 
  found 
  in 
  considerable 
  quantity, 
  in 
  a 
  true 
  granitic 
  veinstone, 
  with 
  

   orthoclase, 
  quartz, 
  black 
  tourmaline 
  and 
  mica. 
  In 
  the 
  same 
  town- 
  

   ship 
  there 
  was 
  wrought 
  a 
  deposit 
  of 
  this 
  ore, 
  having 
  apparently 
  

  

  