﻿Report 
  of 
  the 
  State 
  Geologist. 
  663 
  

  

  three-quarters 
  pyroxene, 
  and 
  are 
  clearly 
  an 
  alteration 
  product 
  

   after 
  pyroxene. 
  The 
  iron 
  ore 
  body 
  appears 
  to 
  have 
  been 
  a 
  great 
  

   shoal, 
  with 
  more 
  or 
  less 
  calcite 
  mixed, 
  but 
  it 
  yielded 
  a 
  very 
  good 
  

   ore 
  extremely 
  low 
  in 
  phosphorus. 
  The 
  workings 
  on 
  the 
  foot- 
  

   wall 
  were 
  over 
  300 
  feet 
  down. 
  The 
  neighboring 
  Hale 
  mine 
  also 
  

   revealed 
  a 
  large 
  body 
  of 
  ore, 
  but 
  was 
  less 
  mined. 
  The 
  associated 
  

   granulite 
  resembles 
  the 
  Saxon 
  augite-granulites. 
  It 
  contains 
  

   microperthite, 
  green 
  pyroxene, 
  quartz 
  and 
  granet 
  and 
  micro- 
  

   scopically 
  is 
  very 
  similar 
  to 
  those 
  of 
  the 
  Saxon 
  " 
  Granulit-gebirge." 
  

   It 
  is 
  hard 
  to 
  say 
  just 
  what 
  its 
  origin 
  is 
  ; 
  pos*ibly 
  it 
  was 
  a 
  shaly 
  

   quartzite 
  in 
  the 
  limestone 
  series. 
  The 
  &fcrip 
  of 
  this 
  series 
  that 
  

   enters 
  Keene 
  from 
  the 
  north 
  is 
  very 
  characteristic. 
  A 
  great 
  bed 
  

   of 
  white 
  graphitic 
  crystalline 
  calcite 
  is 
  interbedded 
  with 
  the 
  

   familiar 
  pyroxene-hornblende 
  schists, 
  and 
  has 
  coccolite, 
  etc., 
  

   associated. 
  It 
  was 
  formerly 
  burned 
  for 
  lime. 
  

  

  The 
  little 
  area 
  upon 
  the 
  mountain 
  at 
  Cascadeville 
  we 
  did 
  not 
  

   explore 
  beyond 
  the 
  iron 
  mine. 
  It 
  afforded 
  in 
  the 
  float 
  beautiful 
  

   diopside 
  and 
  several 
  other 
  minerals 
  in 
  a 
  limestone. 
  Emmons 
  

   regarded 
  it 
  as 
  a 
  dike 
  of 
  calcite, 
  intruded 
  in 
  the 
  norite 
  (Geol. 
  2nd 
  

   Disk, 
  p. 
  228), 
  but 
  he 
  then 
  mentions 
  a 
  list 
  of 
  very 
  characteristic 
  

   contact 
  minerals 
  (pyroxene, 
  idocrase, 
  apatite, 
  scapolite). 
  The 
  

   mass 
  is 
  doubtless 
  a 
  fragment 
  caught 
  up 
  in 
  the 
  intruded 
  anorthosite. 
  

  

  Series 
  III. 
  The 
  anorthosites 
  cover 
  almost 
  all 
  the 
  towns-hip. 
  

   Indeed 
  the 
  heart 
  of 
  the 
  Adirondack 
  is 
  in 
  its 
  southwestern 
  corner. 
  

   Mt. 
  Marcy, 
  the 
  Gothic, 
  Mt. 
  Colden 
  and 
  many 
  more 
  famous 
  

   peaks 
  form 
  a 
  noble 
  group. 
  They 
  furnish 
  anorthosites 
  in 
  their 
  

   most 
  typical 
  development. 
  Hypersthene 
  is 
  quite 
  common 
  and 
  

   even 
  on 
  the 
  highest 
  mountains 
  garnet 
  is 
  not 
  lacking. 
  Specimens 
  

   brought 
  from 
  the 
  top 
  of 
  Marcy 
  reveal 
  it. 
  These 
  rocks 
  are 
  pale 
  

   blue, 
  light 
  green, 
  and 
  even 
  faintly 
  red. 
  Their 
  general 
  characters 
  

   have 
  already 
  been 
  outlined. 
  It 
  was 
  from 
  this 
  region 
  that 
  Dr. 
  A. 
  K. 
  

   Leeds 
  derived 
  most 
  of 
  his 
  material 
  for 
  his 
  valuable 
  paper 
  on 
  their 
  

   lithology. 
  (Twentieth 
  Ann. 
  Kept. 
  N. 
  Y. 
  State 
  Mus. 
  Nat. 
  Hist., 
  

   1*76.) 
  It 
  is 
  the 
  best 
  area 
  for 
  typical 
  anorthosites. 
  As 
  stated 
  in 
  the 
  

   introduction, 
  inclusions 
  of 
  quartz, 
  feldspar 
  and 
  garnet 
  rock 
  were 
  

   found 
  in 
  the 
  anorthosite 
  along 
  the 
  road 
  to 
  Euba 
  Mills. 
  They 
  are 
  

   entirely 
  analogous 
  to 
  the 
  typical 
  German 
  granulite, 
  and 
  doubtless 
  

   are 
  small 
  fragments 
  of 
  some 
  orthoclase 
  rock 
  caught 
  up 
  in 
  the 
  

   intrusive 
  anorthosite. 
  

  

  