﻿62 
  

  

  ME. 
  F. 
  RTTTLEY 
  ON 
  FULGURITES 
  FROM 
  MONTE 
  TISO. 
  

  

  sections 
  are 
  seen 
  which 
  may 
  be 
  referred 
  to 
  rhombic 
  dodecakedra. 
  

   They 
  are 
  isotropic. 
  

  

  From 
  the 
  foregoing 
  observations 
  it 
  appears, 
  therefore, 
  that 
  the 
  

   rock 
  is 
  a 
  glancophane-epidote 
  schist 
  in 
  which 
  garnet, 
  sphene, 
  and 
  

   occasionally 
  diallage 
  are 
  present. 
  

  

  Pig. 
  1 
  shows 
  the 
  general 
  appearance 
  of 
  a 
  section 
  of 
  this 
  

   glaucophane-schist, 
  as 
  viewed 
  in 
  ordinary 
  transmitted 
  light 
  and 
  

   magnified 
  120 
  linear. 
  The 
  large 
  irregularly 
  shaped 
  crystals 
  are 
  

   garnet, 
  the 
  brown 
  and 
  partly 
  opaqne 
  crystals, 
  of 
  which 
  two 
  are 
  shown 
  

   at 
  the 
  bottom 
  of 
  the 
  figure, 
  are 
  sphene, 
  while 
  the 
  remainder 
  consists 
  

   of 
  bine 
  glaucophane 
  and 
  yellowish 
  or 
  yellowish-green 
  epidote. 
  

  

  Professor 
  Judd 
  considers 
  that 
  the 
  rock 
  somewhat 
  closely 
  resembles 
  

   the 
  glaucophane-schists 
  and 
  eclogites 
  of 
  the 
  lie 
  de 
  Groix, 
  off 
  the 
  coast 
  

   of 
  Brittany, 
  described 
  by 
  Dr. 
  Barrois. 
  In 
  the 
  association 
  of 
  glauco- 
  

  

  Glaucopkane-Schist, 
  x 
  120. 
  

  

  phane 
  with 
  epidote 
  it 
  also 
  resembles 
  the 
  glaucophane-schist 
  described 
  

   by 
  Professor 
  Koto, 
  to 
  whose 
  kindness 
  I 
  am 
  indebted 
  for 
  specimens 
  of 
  

   the 
  Otakisan 
  rock. 
  It 
  is 
  also 
  possibly 
  allied, 
  to 
  some 
  extent, 
  in 
  min- 
  

   eral 
  constitution 
  to 
  the 
  glaucophane-eclogite 
  of 
  the 
  Yal 
  d'Aoste, 
  

   described 
  by 
  Professor 
  Bonney 
  *. 
  

  

  The 
  summit 
  of 
  Monte 
  Yiso 
  is 
  stated 
  by 
  Studer 
  to 
  consist 
  of 
  

   serpentine 
  ; 
  but, 
  prior 
  to 
  any 
  microscopic 
  examination 
  of 
  the 
  rock, 
  

   Mr. 
  Eccles 
  expressed 
  his 
  belief 
  that 
  it 
  was 
  probably 
  what 
  Prof. 
  Studer 
  

   had 
  described 
  as 
  "grime 
  Schiefer," 
  and 
  certainly 
  not 
  serpentine, 
  

   although 
  Mr. 
  Eccles 
  remarks 
  that 
  serpentine 
  is 
  not 
  unfrequently 
  

   associated 
  with 
  the 
  " 
  grime 
  Schiefer." 
  

  

  I 
  have 
  to 
  thank 
  Professor 
  Judd 
  for 
  kindly 
  allowing 
  sections 
  from 
  

  

  * 
  Mineralogical 
  Magazine, 
  Dec. 
  1835. 
  

  

  