﻿374 
  Judd 
  and 
  Hidden 
  — 
  BuJjij 
  in 
  North 
  Carolina. 
  

  

  the 
  gems 
  from 
  Burma, 
  and 
  the 
  colors 
  seen 
  in 
  tlie 
  Cowee 
  Creek 
  

   stones 
  with 
  tlie 
  dichroscope 
  are 
  ahnost 
  identical 
  with 
  those 
  

   exhibited 
  by 
  the 
  stones 
  from 
  Burma. 
  As 
  at 
  Mogok, 
  Sagyin, 
  

   and 
  other 
  Burmese 
  localities, 
  the 
  rubies 
  of 
  very 
  line 
  tint 
  are 
  

   mingled 
  with 
  others 
  of 
  lighter 
  or 
  darker 
  shades, 
  and 
  with 
  

   varieties 
  which 
  exhibit 
  more 
  or 
  less 
  of 
  a 
  purplish 
  tint 
  mingled 
  

   with 
  the 
  red. 
  

  

  The 
  Cowee 
  Creek 
  rubies 
  very 
  frequently 
  contain 
  inclusions 
  

   of 
  various 
  kinds. 
  Sometimes 
  these 
  are 
  extremely 
  minute 
  

   ("silk" 
  of 
  jewellers), 
  and 
  give 
  rise 
  to 
  a 
  cloudiness 
  (" 
  sheen 
  ") 
  

   in 
  the 
  polished 
  gems 
  ; 
  at 
  other 
  times 
  minute 
  reniform 
  masses 
  

   of 
  clear 
  red 
  rutile 
  and 
  black 
  menaccanite 
  occur, 
  and 
  mar 
  their 
  

   beauty. 
  The 
  included 
  crystals 
  of 
  garnet, 
  to 
  be 
  hereafter 
  more 
  

   particularly 
  noticed, 
  do 
  not 
  greatly 
  destroy 
  the 
  transparency 
  or 
  

   impair 
  the 
  fine 
  character 
  of 
  the 
  stones. 
  Some 
  specimens 
  have 
  

   been 
  found, 
  how^ever, 
  from 
  which 
  gems 
  of 
  fair 
  size 
  could 
  be 
  

   cut, 
  quite 
  free 
  from 
  inclusions 
  and 
  of 
  fine 
  color 
  and 
  trans- 
  

   parency. 
  

  

  The 
  clearest 
  crystals 
  of 
  the 
  Cowee 
  Creek 
  rubies 
  nearly 
  always 
  

   show 
  the 
  tabular 
  habit 
  which 
  Lagorio 
  regards 
  as 
  characteristic 
  

   of 
  the 
  varieties 
  of 
  corundum 
  that 
  have 
  separated 
  from 
  an 
  

   igneous 
  magma. 
  Indeed, 
  so 
  common 
  is 
  this 
  form, 
  that 
  any 
  

   long 
  plasmatic 
  crystals 
  found 
  with 
  them 
  may 
  be 
  suspected 
  of 
  

   having 
  been 
  derived 
  from 
  the 
  surrounding 
  gneisses, 
  in 
  which 
  

   such 
  forms 
  occur 
  sometimes 
  abundantly. 
  The 
  most 
  common 
  

   combination 
  of 
  forms 
  is 
  that 
  shown 
  in 
  the 
  accompanying 
  draw- 
  

   ing, 
  which 
  has 
  been 
  made 
  by 
  Professor 
  S. 
  L 
  Penfield, 
  of 
  the 
  

   Sheffield 
  Scientific 
  School, 
  Yale 
  University. 
  

  

  Eig". 
  2. 
  Commou 
  form 
  of 
  Corundum 
  Crystals 
  at 
  Cowee 
  Creek. 
  

  

  In 
  an 
  appendix 
  to 
  this 
  paper 
  Dr. 
  Pratt 
  has 
  drawn 
  and 
  

   described 
  some 
  of 
  thechief 
  types 
  of 
  corundum 
  crystals 
  obtained 
  

   in 
  the 
  Cowee 
  district, 
  audit 
  w^ill 
  be 
  found 
  interesting 
  to 
  com- 
  

   pare 
  these 
  with 
  the 
  combinations 
  of 
  forms 
  which 
  the 
  same 
  

   author 
  has 
  described 
  as 
  occurring 
  at 
  Yogo 
  Gulch, 
  Montana,* 
  

   and 
  which 
  Dr. 
  Max 
  Bauer 
  has 
  described 
  from 
  Burma.f 
  

  

  * 
  This 
  Journal, 
  IV, 
  vol. 
  iv, 
  1897, 
  pp. 
  424-428. 
  

  

  \ 
  Neues 
  Jahrb. 
  fiir 
  Miu., 
  etc., 
  1896, 
  Bd. 
  II. 
  pp. 
  197-238. 
  

  

  