﻿232 
  

  

  A. 
  P. 
  lioness 
  — 
  Etching 
  Figures 
  of 
  Beryl. 
  

  

  successful 
  in 
  establishing 
  the 
  symmetry 
  of 
  the 
  mineral 
  by 
  

   means 
  of 
  several 
  different 
  natural 
  etchings 
  hitherto 
  undescribed. 
  

   While 
  but 
  three 
  or 
  four 
  different 
  forms 
  have 
  been 
  etched 
  on 
  

   the 
  crystals 
  present, 
  these 
  are, 
  in 
  every 
  case, 
  so 
  distinct 
  and 
  so 
  

   well 
  defined 
  as 
  to 
  reveal 
  very 
  clearly 
  the 
  symmetry 
  of 
  the 
  face 
  

   upon 
  which 
  they 
  occur. 
  

  

  The 
  first 
  to 
  be 
  described 
  is 
  a 
  light 
  green 
  crystal 
  almost 
  trans- 
  

   parent, 
  with 
  the 
  forms 
  1010, 
  1120, 
  and 
  0001 
  well 
  developed, 
  

   collected 
  near 
  Hicldenite, 
  North 
  Carolina 
  (diagram 
  A, 
  fig. 
  13). 
  

  

  Fig. 
  14. 
  

  

  Dia.C-1 
  

  

  Dia.c-rr 
  

  

  The 
  unit 
  prism 
  1010 
  contains 
  many 
  small 
  pits, 
  more 
  or 
  less 
  

   quadrilateral, 
  extending 
  across 
  the 
  face, 
  with 
  their 
  long 
  axes 
  

   at 
  right 
  angles 
  to 
  6. 
  The 
  figures 
  are 
  bounded 
  by 
  straight 
  and 
  

   curved 
  lines, 
  the 
  smaller 
  forms 
  having 
  1 
  rounded 
  terminations. 
  

  

  The 
  quadrilateral 
  outline 
  of 
  the 
  larger 
  figures 
  is 
  more 
  apparent 
  

   as 
  they 
  are 
  composed 
  of 
  upper 
  and 
  lower 
  faces 
  (diagram 
  A), 
  

   and 
  occasionally 
  right 
  and 
  left 
  faces, 
  very 
  rarely 
  a 
  plane 
  

   parallel 
  to 
  the 
  prism 
  face. 
  Figures 
  of 
  various 
  shapes 
  are 
  

   rej)resented 
  upon 
  a 
  single 
  face, 
  indicating 
  various 
  develop- 
  

   mental 
  stages 
  of 
  growth. 
  The 
  figures 
  are 
  symmetrical 
  to 
  one 
  

   vertical 
  and 
  one 
  horizontal 
  plane. 
  

  

  The 
  second-order 
  prism 
  1120 
  is 
  a 
  very 
  narrow 
  face 
  and 
  con- 
  

   tains 
  but 
  few 
  distinct 
  forms. 
  These 
  are 
  perfect 
  spindle-shaped 
  

   pits 
  elongated 
  parallel 
  to 
  the 
  vertical 
  axis 
  of 
  the 
  crystal, 
  and 
  

   resemble 
  very 
  closely 
  the 
  natural 
  figures 
  occurring 
  on 
  the 
  

   1120 
  form 
  of 
  Brazilian 
  beryls, 
  as 
  described 
  by 
  Kohlmann.* 
  

   The 
  six-sided 
  forms 
  described 
  by 
  Kohlmann 
  as 
  primitive 
  figures 
  

   are 
  absent 
  on 
  the 
  North 
  Carolina 
  crystal. 
  

  

  Base. 
  — 
  On 
  the 
  base 
  are 
  beautiful, 
  regular, 
  hexagonal 
  pits, 
  

   with 
  the 
  sides 
  parallel 
  to 
  the 
  edge 
  0001/1010 
  (see 
  1 
  and 
  2, 
  

  

  