﻿Washington 
  — 
  Igneous 
  Rocks 
  from 
  Smyrna, 
  etc. 
  45 
  

  

  An 
  analysis 
  of 
  the 
  rock 
  of 
  Kara 
  Tash 
  by 
  the 
  writer 
  is 
  given. 
  

   As 
  will 
  be 
  seen, 
  it 
  resembles 
  in 
  general 
  that 
  of 
  the 
  Mt. 
  Pagos 
  

  

  Si0 
  ._ 
  61-93 
  

  

  A1 
  2 
  3 
  18-47 
  

  

  Fe 
  2 
  3 
  1-93 
  

  

  FeO 
  2-23 
  

  

  MgO.._ 
  2-66 
  

  

  CaO 
  4-31 
  

  

  Na 
  2 
  292 
  

  

  K 
  2 
  G 
  3-92 
  

  

  H 
  2 
  2-28 
  

  

  100-65 
  

  

  rock, 
  though 
  silica 
  is 
  somewhat 
  higher 
  and 
  lime 
  a 
  little 
  lower, 
  

   while 
  alkalies, 
  ferrous 
  oxide 
  and 
  magnesia 
  remain 
  almost 
  

   exactly 
  the 
  same. 
  Alumina 
  is, 
  however, 
  much 
  higher 
  and 
  

   ferric 
  oxide 
  lower. 
  Water 
  also 
  is 
  much 
  higher, 
  which 
  may 
  

   be 
  attributed 
  to 
  the 
  abundant 
  glass. 
  

  

  One 
  of 
  Mr. 
  Diller's 
  specimens 
  from 
  the 
  coast 
  4 
  km 
  west 
  of 
  

   Smyrna, 
  between 
  Kara 
  Tash 
  and 
  Gioz 
  Tepe, 
  shows 
  very 
  clearly 
  

   the 
  red 
  and 
  black 
  banding 
  already 
  mentioned. 
  The 
  black 
  

   bands 
  resemble 
  the 
  rock 
  just 
  described, 
  while 
  the 
  red 
  look 
  more 
  

   like 
  the 
  Pagos 
  specimens. 
  

  

  Under 
  the 
  microscope 
  both 
  bands 
  resemble 
  somewhat 
  more 
  

   the 
  Pagos 
  rock 
  than 
  that 
  of 
  Kara 
  Tash 
  proper, 
  though 
  they 
  

   differ 
  from 
  either. 
  The 
  phenocrysts, 
  which 
  are 
  of 
  labradorite, 
  

   diopside 
  and 
  some 
  biotite, 
  are 
  often 
  fragmentary 
  and 
  the 
  finely 
  

   automorphic 
  crystal 
  boundaries 
  of 
  the 
  Kara 
  Tash 
  phenocrysts 
  

   are 
  lacking. 
  The 
  red 
  bands 
  show 
  a 
  slight 
  brown 
  coloration 
  of 
  

   the 
  diopsides 
  and 
  biotites, 
  with 
  limonitic 
  spots 
  here 
  and 
  there. 
  

   The 
  base 
  is 
  a 
  clear 
  colorless 
  glass, 
  and 
  is 
  quite 
  Iryalopilitic 
  

   through 
  the 
  presence 
  of 
  numerous 
  minute, 
  straight, 
  trans- 
  

   parent, 
  colorless 
  trichites, 
  with 
  some 
  larger 
  feldspar 
  laths. 
  The 
  

   ground 
  mass 
  of 
  the 
  black 
  streaks 
  shows 
  in 
  addition 
  large 
  

   amounts 
  of 
  fine 
  " 
  dust," 
  which 
  gives 
  it 
  a 
  dirty 
  appearance 
  and 
  

   greatly 
  interferes 
  with 
  its 
  transparency. 
  In 
  this 
  it 
  resembles 
  

   the 
  dusty 
  streaks 
  of 
  the 
  Kara 
  Tash 
  specimens. 
  

  

  Another 
  specimen 
  from 
  the 
  coast 
  3 
  km 
  west 
  of 
  Smyrna 
  shows 
  

   a 
  fine-grained 
  reddish 
  groundmass 
  containing 
  very 
  many 
  glassy 
  

   feldspars 
  and 
  some 
  small 
  brown 
  spots 
  representing 
  original 
  

   augite 
  and 
  biotite 
  crystals. 
  In 
  thin 
  section 
  it 
  greatly 
  resem- 
  

   bles 
  the 
  red 
  Pagos 
  rocks, 
  and 
  all 
  except 
  the 
  feldspar 
  is 
  much 
  

   decomposed. 
  The 
  diopsides 
  are 
  all 
  deeply 
  bordered 
  with 
  

   brown, 
  the 
  biotites 
  are 
  all 
  entirely 
  reduced 
  to 
  brown 
  rusty 
  

   masses, 
  and 
  the 
  groundmass 
  is 
  much 
  decomposed 
  and 
  dirty. 
  

  

  Another 
  specimen 
  from 
  near 
  the 
  same 
  place 
  shows 
  a 
  dark, 
  

  

  