﻿220 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  bined 
  with 
  the 
  combination 
  of 
  the 
  later 
  generation 
  and 
  attain 
  a 
  size 
  

   of 
  5 
  centimeters 
  on 
  edge. 
  They 
  have 
  in 
  these 
  instances 
  a 
  markedly 
  

   cubic 
  aspect. 
  Figure 
  3 
  shows 
  the 
  rhombohedron 
  of 
  this 
  phase. 
  

   The 
  compound 
  crystals 
  which 
  were 
  noted 
  on 
  one 
  specimen 
  of 
  the 
  

  

  Fig. 
  3 
  

  

  Fig. 
  4 
  

  

  series 
  available, 
  consist 
  of 
  the 
  rhombohedral 
  element 
  noted 
  above, 
  

   upon 
  the 
  polar 
  angles 
  of 
  which 
  are 
  superposed 
  in 
  parallel 
  position 
  

   the 
  scalenohedral 
  combination 
  shown 
  in 
  figure 
  4. 
  The 
  compound 
  

   crystals 
  average 
  10 
  millimeters 
  in 
  vertical 
  length. 
  On 
  the 
  scaleno- 
  

   hedral 
  elements, 
  which 
  represent 
  the 
  later 
  generation 
  of 
  calcite 
  

   deposition, 
  the 
  following 
  forms 
  were 
  observed: 
  <t 
  (7180), 
  ^. 
  

   (0112), 
  w: 
  (3,145). 
  K: 
  (2131), 
  p: 
  (1341), 
  b: 
  (3584) 
  and 
  X: 
  

   (4.16.20.3). 
  The 
  new 
  dihexagonal 
  prism 
  = 
  00 
  R 
  - 
  = 
  (7180^ 
  

  

  is 
  represented 
  by 
  brilliant, 
  well 
  developed 
  planes 
  which 
  gave 
  good 
  

   reflections 
  of 
  the 
  goniometer 
  signal 
  and 
  lay 
  well 
  in 
  the 
  vertJcal 
  

   zone. 
  The 
  following 
  zones 
  were 
  also 
  observed 
  : 
  

  

  [1780 
  : 
  i7o2 
  : 
  3145^: 
  3584: 
  1341^4.16.203 
  : 
  1780I 
  

  

  [43II' 
  3121-2131: 
  1341] 
  

   [7705:4135:3145:0775] 
  

   [2131:3584:0775:3211] 
  

  

  Calcite 
  crystals 
  of 
  negative 
  scalenohedral 
  habit 
  were 
  noted 
  on 
  

  

  one 
  specimen 
  which 
  yielded 
  measurements 
  approximating 
  those 
  for 
  

  

  11" 
  — 
  ' 
  

  

  the 
  scalenohedron 
  — 
  — 
  R 
  — 
  = 
  (22.55.77.36) 
  described 
  by 
  vom 
  

  

  Rath 
  from 
  Bergen 
  Hill.^ 
  The 
  measured 
  angles 
  obtained 
  from 
  the 
  

  

  ' 
  vom 
  Rath, 
  G. 
  Der 
  Kalkspath 
  von 
  Bergen 
  Hill, 
  N. 
  .f 
  Zeit. 
  f. 
  Kryst. 
  

   1877. 
  2-604. 
  

  

  