﻿84 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  the 
  most 
  favorable 
  locality 
  is 
  the 
  pegmatite 
  dike 
  lying 
  along 
  the 
  

   west 
  side 
  of 
  the 
  gabbro 
  dike 
  on 
  the 
  mountain 
  top 
  I 
  mile 
  south- 
  

   southeast 
  of 
  The 
  Glen. 
  A 
  single 
  mass 
  of 
  pegmatite 
  there 
  is 
  about 
  

   25 
  feet 
  wide 
  and 
  50 
  feet 
  long 
  and 
  very 
  rich 
  in 
  orthoclase 
  and 
  

   albite 
  crystals 
  up 
  to 
  5 
  or 
  6 
  inches 
  in 
  length, 
  together 
  with 
  more 
  

   or 
  less 
  quartz 
  and 
  black 
  tourmalin. 
  The 
  nearness 
  to 
  the 
  railroad 
  

   station 
  and 
  the 
  fact 
  that 
  an 
  old 
  road 
  now 
  extends 
  nearly 
  to 
  the 
  top 
  

   of 
  the 
  mountain, 
  are 
  features 
  favorable 
  to 
  mining 
  here, 
  but 
  the 
  small 
  

   size 
  of 
  the 
  exposed 
  mass 
  and 
  the 
  abundance 
  of 
  albite 
  are 
  un- 
  

   favorable. 
  

  

  ROAD 
  METAL 
  

  

  Rock 
  such 
  as 
  that 
  of 
  the 
  diabase 
  dikes 
  of 
  the 
  quadrangle 
  is 
  

   popularly 
  known 
  as 
  " 
  trap 
  rock," 
  and 
  it 
  takes 
  rank 
  among 
  the 
  

   finest 
  natural 
  road 
  building 
  materials 
  because 
  of 
  its 
  hardness, 
  fine- 
  

   ness 
  of 
  grain, 
  homogeneity, 
  and 
  good 
  binding 
  power. 
  So 
  far 
  not 
  

   a 
  single 
  quarry 
  has 
  been 
  opened 
  in 
  any 
  of 
  these 
  dikes 
  though 
  some 
  

   of 
  them 
  are 
  large 
  and 
  well 
  situated 
  with 
  respect 
  to 
  roads 
  and 
  good 
  

   quarry 
  drainage. 
  Among 
  such 
  dikes 
  are 
  those 
  at 
  the 
  west 
  base 
  of 
  

   Heath 
  mountain 
  (Ingraham 
  farm) 
  ; 
  iy 
  2 
  miles 
  north-northeast 
  of 
  

   Pottersville 
  ; 
  and 
  two-thirds 
  of 
  a 
  mile 
  a 
  little 
  south 
  of 
  west 
  of 
  

   Igerna. 
  Smaller, 
  but 
  well 
  located, 
  dikes 
  are 
  three-fourths 
  of 
  a 
  

   mile 
  southeast 
  of 
  Kelm 
  mountain 
  and 
  one-half 
  of 
  a 
  mile 
  southeast 
  

   of 
  The 
  Glen. 
  

  

  The 
  gabbro 
  masses, 
  especially 
  the 
  more 
  basic 
  ones, 
  would 
  furnish 
  

   a 
  very 
  large 
  amount 
  of 
  good 
  road 
  material. 
  This 
  rock 
  is 
  hard, 
  

   homogeneous 
  and 
  rich 
  in 
  iron-bearing 
  minerals 
  to 
  give 
  good 
  bind- 
  

   ing 
  power. 
  So 
  far 
  but 
  two 
  quarries 
  have 
  been 
  opened 
  in 
  the 
  

   gabbros 
  and 
  these 
  for 
  State 
  road 
  purposes. 
  One 
  of 
  these 
  quarries 
  is 
  

   in 
  the 
  south 
  end 
  of 
  the 
  large, 
  coarse 
  grained, 
  gabbro 
  boss 
  on 
  the 
  

   south 
  side 
  of 
  Loon 
  lake, 
  and 
  the 
  other 
  is 
  in 
  the 
  gabbro 
  boss 
  1 
  

   mile 
  west 
  of 
  Riverside 
  and 
  near 
  the 
  new 
  State 
  road. 
  

  

  The 
  basic 
  varieties 
  of 
  syenite, 
  especially 
  those 
  free 
  from 
  mica 
  

   and 
  low 
  in 
  quartz, 
  would 
  also 
  make 
  good 
  road 
  metal, 
  but 
  no 
  quar- 
  

   ries 
  have 
  yet 
  been 
  opened 
  in 
  such 
  rock. 
  

  

  The 
  granite 
  and 
  granite 
  porphyry 
  in 
  general 
  are 
  rather 
  poor 
  

   road 
  materials 
  because 
  of 
  the 
  high 
  quartz 
  and 
  mica 
  content 
  and 
  the 
  

   usual 
  deficiency 
  of 
  iron-bearing 
  minerals 
  to 
  furnish 
  a 
  good 
  binder. 
  

   Such 
  rock 
  has, 
  however, 
  been 
  rather 
  extensively 
  quarried 
  at 
  three 
  

   places 
  for 
  State 
  road 
  work. 
  One 
  of 
  these 
  quarries 
  is 
  situated 
  

   two-thirds 
  of 
  a 
  mile 
  north 
  of 
  the 
  north 
  end 
  of 
  Loon 
  lake 
  and 
  above 
  

   the 
  road 
  ; 
  the 
  second 
  is 
  along 
  the 
  State 
  road 
  1 
  }i 
  miles 
  northeast 
  of 
  

  

  