﻿146 
  

  

  figured 
  ; 
  but 
  those- 
  which 
  are 
  here 
  introduced 
  are 
  worthy 
  of 
  notice. 
  

   They 
  are 
  of 
  the 
  actual 
  size, 
  and 
  from 
  one-third 
  to 
  one-half 
  an 
  inch 
  in 
  

   thickness. 
  

  

  Dr. 
  Leonard 
  informs 
  me 
  that 
  next 
  to 
  the 
  six 
  hemitropes, 
  the 
  most 
  

   common 
  combination 
  is 
  that 
  of 
  two 
  united 
  by 
  their 
  apexes. 
  

  

  Specimens 
  of 
  columbite 
  have 
  been 
  found 
  by 
  Dr. 
  Leonard, 
  associated 
  

   with 
  chrysoberyl, 
  at 
  the 
  Greenfield 
  locality. 
  

  

  Descloizeaux 
  has 
  published 
  under 
  the 
  crystaline 
  forms 
  of 
  cymophane, 
  

   a 
  detailed 
  description, 
  with 
  plates, 
  and 
  M. 
  Biot 
  has 
  made 
  some 
  experi- 
  

   ments 
  upon 
  the 
  structure 
  of 
  this 
  mineral 
  in 
  regard 
  to 
  polarized 
  light. 
  

   Ann. 
  de 
  Chim, 
  et 
  de 
  Phys. 
  xiii, 
  329, 
  335. 
  

  

  ORDER 
  IV. 
  ZIRCONIA. 
  

  

  ZIRCONITE. 
  

   (Mineralogy 
  of 
  New-York, 
  page 
  378.) 
  

  

  This 
  mineral 
  has 
  been 
  found 
  in 
  New 
  Sweden, 
  Essex 
  county, 
  (Em- 
  

   mons* 
  Rep. 
  GeoL, 
  2d 
  Dist., 
  p. 
  286;) 
  Putnam 
  Valley, 
  Putnam 
  county, 
  

   {Fountain 
  ;) 
  and 
  on 
  the 
  farm 
  of 
  Mr. 
  Cleaveland 
  in 
  Diana, 
  Lewis 
  county. 
  

   At 
  the 
  latter 
  locality 
  it 
  occurs 
  rarely, 
  but 
  the 
  crystals, 
  although 
  small, 
  

   are 
  very 
  brilliant. 
  F. 
  B. 
  Hough, 
  who 
  quotes 
  Mr. 
  Wilder, 
  Sill. 
  Jour., 
  

   Jan., 
  1848. 
  

  

  I 
  have 
  also 
  received 
  specimens 
  from 
  Mr. 
  Charles 
  Thomas, 
  which 
  

   were 
  obtained 
  from 
  a 
  mine 
  of 
  magnetic 
  iron 
  ore, 
  near 
  Port 
  Henry, 
  Es- 
  

   sex 
  county. 
  In 
  form 
  and 
  color 
  the 
  crystals 
  resemble 
  those 
  from 
  the 
  

   Hall 
  mine 
  in 
  the 
  same 
  county. 
  

  

  