﻿No. 
  123.] 
  43 
  

  

  Sulphate 
  of 
  barytes. 
  Limpid 
  crystals 
  of 
  this 
  mineral, 
  from 
  

   one 
  line 
  to 
  half 
  an 
  inch 
  in 
  extent, 
  have 
  been 
  noticed 
  

   associated 
  with 
  calcite 
  and 
  spathic 
  iron, 
  at 
  the 
  iron 
  

   mines 
  in 
  Rossie, 
  St, 
  Lawrence 
  county. 
  They 
  are 
  of 
  es- 
  

   pecial 
  interest, 
  as 
  representing 
  crystalline 
  forms 
  not 
  

   hitherto 
  attributed 
  to 
  this 
  State. 
  The 
  following 
  figures 
  

   exhibit 
  the 
  forms 
  observed 
  at 
  this 
  locality. 
  

  

  Figs. 
  

  

  Fig 
  3. 
  

  

  Fig 
  4. 
  

  

  At 
  times, 
  the 
  thickness 
  of 
  the 
  tabular 
  crystals 
  greatly 
  exceeds 
  

   their 
  length, 
  and 
  they 
  become 
  rectangular 
  prisms, 
  with 
  flat 
  sum- 
  

   mits 
  and 
  bevelled 
  edges. 
  

  

  Heavy 
  spar 
  is 
  among 
  the 
  rarest 
  of 
  the 
  associates 
  of 
  specular 
  

   iron 
  in 
  Northern 
  New 
  -York, 
  although 
  it 
  occurs 
  among 
  the 
  white 
  

   limestone 
  at 
  some 
  localities, 
  in 
  great 
  abundance. 
  

  

  F. 
  B. 
  HOUGH. 
  

  

  