﻿42 
  ' 
  [Assembly 
  

  

  The 
  rock 
  in 
  which 
  these 
  occur 
  is 
  white 
  limestone, 
  rising 
  in 
  this 
  

   place 
  but 
  a 
  slight 
  distance 
  above 
  the 
  general 
  level, 
  and 
  the 
  depo- 
  

   site 
  is 
  apparently 
  limited 
  to 
  a 
  few 
  feet 
  in 
  extent. 
  

  

  From 
  observations 
  made 
  since 
  the 
  description 
  was 
  published, 
  

   there 
  is 
  reason 
  to 
  believe 
  that 
  this 
  mineral 
  is 
  pseudomorphous 
  

   of 
  spinelle. 
  It 
  is, 
  however, 
  but 
  very 
  rarely 
  crystalized, 
  and 
  oc- 
  

   curs 
  usually 
  in 
  nodular 
  masses, 
  vvith 
  a 
  white 
  or 
  pearly 
  grey 
  color 
  

   externally 
  and 
  reddish 
  brown 
  within. 
  A 
  crystal 
  of 
  spinelle 
  

   has 
  been 
  noticed 
  in 
  some 
  instances 
  as 
  a 
  nucleus 
  to 
  these 
  globules. 
  

   This 
  locality 
  is 
  mentioned 
  in 
  the 
  State 
  Report 
  on 
  Mineralogy 
  as 
  

   furnishing 
  serpentine 
  and 
  mica. 
  

  

  Zircon, 
  having 
  the 
  prevailing 
  form 
  of 
  the 
  following 
  figure, 
  oc- 
  

  

  Figure 
  1. 
  

  

  . 
  curs 
  one 
  mile 
  from 
  Rossie 
  village, 
  St. 
  Lawrence 
  coun- 
  

   ty. 
  From 
  its 
  occurrence 
  at 
  diiferent 
  localities 
  in 
  the 
  

   same 
  range 
  for 
  three 
  or 
  four 
  miles, 
  there 
  may 
  be 
  reason 
  

   to 
  hope 
  that 
  it 
  will 
  hereafter 
  be 
  detected 
  in 
  considera- 
  

   ble 
  quantities. 
  Hitherto 
  it 
  has 
  been 
  found 
  only 
  in 
  de- 
  

   tached 
  crystals, 
  sparingly 
  scattered 
  through 
  white 
  lime- 
  

   stone, 
  and 
  associated 
  with 
  apatite, 
  graphite, 
  loxoclase, 
  

   &c. 
  

  

  The 
  form 
  here 
  represented 
  is 
  not 
  figured 
  in 
  the 
  mineralogical 
  

   report 
  of 
  Prof. 
  Lewis 
  C. 
  Beck, 
  and 
  is 
  an 
  interesting 
  addition 
  tO" 
  

   the 
  crystalline 
  forms 
  of 
  this 
  mineral. 
  It 
  seldom 
  occurs 
  with 
  the 
  

   symmetry 
  of 
  t])e 
  rigure, 
  but 
  is 
  ujjually 
  greatly 
  distorted 
  by 
  the 
  

   extension 
  of 
  some 
  of 
  the 
  planes 
  at 
  the 
  expense 
  of 
  tla^. 
  others. 
  

   The 
  intervening 
  prism 
  is 
  at 
  times 
  obliterated. 
  The 
  terminal 
  

   planes 
  are 
  usually 
  the 
  most 
  brilliant, 
  while 
  those 
  which 
  separate 
  

   these 
  from 
  the 
  prismatic 
  portion 
  have 
  a 
  dull 
  wrinkled 
  surface, 
  

   with 
  occasional 
  strise 
  in 
  the 
  direction 
  of 
  the 
  natural 
  cleavage. 
  

   Specimens 
  of 
  these 
  have 
  been 
  placed 
  in 
  the 
  State 
  Cabinet. 
  

  

  