﻿86 
  TWENTY-FIRST 
  REPORT 
  ON 
  THE 
  STATE 
  CABINET. 
  

  

  and 
  zircon 
  mentioned 
  above, 
  often 
  present 
  a 
  mere 
  outer 
  shell 
  of 
  

   corundum 
  filled 
  up 
  with 
  other 
  minerals. 
  The 
  corundum 
  found 
  in 
  

   Canada 
  is 
  imbedded 
  in 
  calcite 
  with 
  pyroxene, 
  sphene 
  and 
  mica, 
  

   and 
  very 
  closely 
  resembling 
  those 
  associated 
  with 
  it 
  at 
  Vernon. 
  

  

  Quartz. 
  — 
  The 
  presence 
  of 
  crystalline 
  quartz 
  in 
  the 
  Laurentian 
  

   veinstones 
  has 
  already 
  been 
  repeatedly 
  noticed. 
  Sometimes, 
  as 
  at 
  

   Gouverneur, 
  New 
  York, 
  it 
  is 
  found 
  in 
  crystals 
  with 
  rounded 
  an- 
  

   gles 
  imbedded 
  in 
  crystalline 
  calcite 
  ; 
  at 
  other 
  times 
  implanted 
  on 
  

   apatite, 
  as 
  in 
  Burgess, 
  wherethe 
  crystals 
  are 
  occasionally 
  amethy- 
  

   stine, 
  smoke-brown 
  or 
  opaque-red 
  in 
  color, 
  and 
  unlike 
  the 
  apatite, 
  

   to 
  which 
  they 
  are 
  posterior, 
  have 
  not 
  their 
  angles 
  rounded. 
  

   Quartz 
  is 
  of 
  very 
  common 
  occurrence 
  in 
  the 
  veins, 
  mingled 
  with 
  

   wollastonite, 
  pyroxene 
  or 
  orthoclase, 
  and 
  a 
  vitreous 
  quartz 
  is 
  

   sometimes 
  the 
  gangue 
  of 
  crystallized 
  brown 
  tourmaline 
  and 
  of 
  

   apatite. 
  It 
  is 
  also 
  frequently 
  disseminated 
  in 
  grains 
  or 
  small 
  

   masses 
  in 
  the 
  limestone 
  beds, 
  or 
  forms 
  in 
  the 
  accompanying 
  strata 
  

   layers, 
  in 
  which 
  it 
  is 
  sometimes 
  mingled 
  with 
  wollastonite, 
  with 
  

   green 
  pyroxene, 
  with 
  garnet, 
  or 
  with 
  orthoclase. 
  Besides 
  these, 
  

   thin 
  layers 
  and 
  massive 
  beds 
  of 
  quartzite 
  are 
  frequent, 
  and 
  are 
  

   often 
  interstratified 
  with 
  the 
  limestones. 
  

  

  Sphene. 
  — 
  This 
  is 
  one 
  of 
  the 
  most 
  common 
  minerals 
  of 
  the 
  cal- 
  

   careous 
  Laurentian 
  veins, 
  and 
  its 
  occurrence 
  and 
  associations 
  have 
  

   already 
  been 
  repeatedly 
  mentioned. 
  It 
  also 
  occurs 
  in 
  small 
  grains 
  

   or 
  crystals, 
  orenerally 
  olive-brown 
  in 
  color, 
  disseminated 
  in 
  the 
  

   stratified 
  limestones, 
  or 
  more 
  frequently 
  in 
  the 
  associated 
  pyrox- 
  

   enic 
  and 
  feldspathic 
  strata. 
  

  

  Rutile 
  — 
  Ilmenite. 
  — 
  Both 
  of 
  these 
  species 
  are 
  occasionally 
  found 
  

   crystallized 
  in 
  Laurentian 
  veins 
  with 
  spinel, 
  chondrodite, 
  corun- 
  

   dum, 
  etc., 
  or 
  imbedded 
  in 
  serpentine. 
  The 
  imbedded 
  grains 
  and 
  

   masses 
  of 
  ilmenite, 
  often 
  of 
  great 
  size, 
  and 
  sometimes 
  intermixed 
  

   with 
  rutile, 
  which 
  occur 
  at 
  Bay 
  St. 
  Paul, 
  Chateau 
  Richer, 
  and 
  else- 
  

   where 
  in 
  the 
  province 
  of 
  Quebec, 
  appear 
  to 
  belong 
  to 
  the 
  Upper 
  

   Laurentian 
  or 
  Labrador 
  series, 
  and 
  neither 
  of 
  these 
  minerals 
  have 
  

   as 
  yet 
  been 
  met 
  with 
  in 
  the 
  proper 
  Laurentian 
  rocks 
  in 
  Canada, 
  

   although 
  occurhw 
  in 
  several 
  localities 
  in 
  New 
  York. 
  The 
  ilme- 
  

   nite 
  crystals, 
  with 
  serpentine, 
  from 
  Snarum, 
  and 
  with 
  hornblende 
  

   and 
  calcite 
  from 
  Krageroe, 
  are 
  well 
  known 
  to 
  mineralogists. 
  

  

  Magnetite. 
  — 
  This 
  important 
  iron 
  ore, 
  which 
  constitutes 
  one 
  of 
  

   the 
  principal 
  sources 
  of 
  mineral 
  wealth 
  to 
  the 
  Laurentian 
  regions 
  

  

  