﻿S. 
  L. 
  Peafield 
  — 
  Graftonite, 
  a 
  neiv 
  Mineral. 
  

  

  25 
  

  

  m 
  ^ 
  m, 
  

  

  I 
  ^ 
  

  

  e 
  /n 
  e, 
  

  

  110 
  ^ 
  110 
  

   I, 
  120 
  ^ 
  120 
  

   ?i, 
  010 
  xs 
  130 
  

  

  021 
  /s 
  021 
  

  

  Measured. 
  

  

  115° 
  

   22 
  30' 
  

  

  p 
  ^ 
  p, 
  111 
  /s 
  

  

  111 
  = 
  

  

  Calculated. 
  

  

  78° 
  00' 
  

   116 
  36, 
  fig. 
  6 
  

  

  22 
  22, 
  fig: 
  2 
  

  

  93 
  31 
  

  

  41 
  32 
  

  

  Figures 
  2 
  to 
  7 
  represent 
  the 
  crystals 
  which 
  were 
  available 
  

   for 
  study. 
  Fig. 
  2, 
  drawn 
  with 
  b, 
  010, 
  in 
  front, 
  shows 
  a 
  portion 
  

   of 
  a 
  crystal, 
  about 
  5 
  cm 
  wide, 
  which 
  is 
  attached 
  to 
  a 
  rather 
  large, 
  

   irregular 
  mass 
  of 
  graftonite 
  associated 
  with 
  biotite. 
  In 
  this 
  

   and 
  in 
  other 
  figures 
  no 
  attempt 
  has 
  been 
  made 
  to 
  represent 
  by 
  

   means 
  of 
  an 
  artistic 
  effect 
  the 
  irregular, 
  broken 
  surfaces 
  of 
  the 
  

   graftonite 
  and 
  associated 
  minerals. 
  The 
  stippled 
  portions 
  of 
  

   the 
  figures 
  are 
  intended 
  to 
  represent 
  the 
  irregular 
  surfaces, 
  and, 
  

   if 
  carried 
  out 
  in 
  the 
  proper 
  proportion 
  in 
  fig. 
  2, 
  the 
  stippling 
  

  

  should 
  continue 
  for 
  a 
  considerable 
  distance 
  above 
  and 
  to 
  the 
  

   right, 
  beyond 
  the 
  limits 
  of 
  the 
  figure. 
  Fig. 
  3 
  represents 
  two 
  

   crystals, 
  about 
  7 
  cm 
  long, 
  which 
  have 
  grown 
  together 
  in 
  parallel 
  

   position 
  and 
  have 
  suffered 
  deformation, 
  the 
  vertical 
  edges 
  and 
  

   faces 
  of 
  the 
  prism 
  being 
  decidedly 
  curved, 
  although 
  the 
  mono- 
  

   symmetric 
  character 
  of 
  the 
  crystal 
  seems 
  not 
  to 
  have 
  been 
  dis- 
  

   turbed. 
  ]STo 
  cracks, 
  resulting 
  from 
  cleavage 
  or 
  fracture, 
  are 
  

   visible 
  in 
  this 
  specimen, 
  and 
  no 
  other 
  specimen 
  was 
  observed 
  

   which 
  showed 
  similar 
  deformation. 
  Figs. 
  4, 
  5, 
  6 
  and 
  7 
  repre- 
  

   sent 
  fragments 
  and 
  corners 
  of 
  much 
  decomposed 
  crystals 
  with 
  

   rough 
  faces. 
  The 
  material 
  as 
  a 
  whole 
  was 
  very 
  unfavorable 
  

   for 
  crystallographic 
  study, 
  and 
  it 
  is 
  possible 
  that 
  the 
  conclu- 
  

   sions 
  reached 
  concerning 
  the 
  orientation 
  of 
  some 
  of 
  the 
  crystals 
  

   and 
  the 
  identification 
  of 
  the 
  forms 
  are 
  erroneous, 
  although, 
  as 
  

   far 
  as 
  could 
  be 
  told 
  with 
  the 
  contact 
  goniometer, 
  the 
  measure- 
  

  

  