﻿IOO 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  4 
  As 
  more 
  or 
  less 
  distinct 
  crystals 
  (dodecahedral), 
  without 
  

   hornblende 
  rims, 
  in 
  a 
  certain 
  special 
  basic 
  syenitelike 
  or 
  acidic 
  

   dioritelike 
  rock. 
  

  

  In 
  case 
  number 
  I 
  (for 
  example, 
  Parker 
  and 
  Sanders 
  Brothers 
  

   mines) 
  the 
  garnets 
  have, 
  in 
  the 
  usual 
  manner, 
  crystallized 
  out 
  of 
  

   masses 
  of 
  sediments 
  under 
  conditions 
  of 
  thermal 
  and 
  dynamic 
  

   metamorphism. 
  These 
  garnets 
  are 
  rarely 
  as 
  much 
  as 
  an 
  inch 
  

   across 
  and 
  their 
  origin 
  presents 
  no 
  problem 
  of 
  special 
  interest. 
  

  

  In 
  case 
  number 
  2 
  the 
  garnets 
  appear 
  mostly 
  to 
  have 
  crystal- 
  

   lized 
  out 
  of 
  the 
  original 
  magmas, 
  their 
  formation 
  possibly 
  having 
  

   been 
  due 
  to 
  some 
  assimilation 
  of 
  granville 
  sediment 
  by 
  the 
  syen- 
  

   ite 
  or 
  granite. 
  The 
  facts 
  that 
  these 
  garnets 
  occur 
  so 
  sporadi- 
  

   cally 
  and 
  that 
  actual 
  examples 
  of 
  local 
  assimilation 
  have 
  been 
  ob- 
  

   served 
  in 
  the 
  region 
  strongly 
  favor 
  this 
  view. 
  Since 
  these 
  gar- 
  

   nets 
  seldom 
  attain 
  a 
  diameter 
  of 
  an 
  inch 
  and 
  are 
  so 
  scattered, 
  

   no 
  attempt 
  has 
  ever 
  been 
  made 
  to 
  mine 
  them. 
  Sometimes, 
  as 
  in 
  

   the 
  gabbros, 
  the 
  garnets 
  have 
  often 
  been 
  produced 
  secondarily, 
  or 
  

   after 
  the 
  cooling 
  of 
  the 
  magma, 
  because 
  they 
  commonly 
  form 
  re- 
  

   action 
  rims 
  around 
  other 
  minerals. 
  

  

  Case 
  number 
  3 
  (for 
  example, 
  Rogers, 
  Oven 
  mountain, 
  and 
  

   Rexford 
  mines) 
  is 
  of 
  particular 
  interest 
  because 
  of 
  the 
  very 
  large 
  

   garnets 
  surrounded 
  by 
  the 
  reaction 
  rims 
  of 
  hornblende. 
  

  

  Kemp 
  and 
  Newland 
  1 
  have 
  briefly 
  described 
  a 
  garnet 
  deposit 
  

   (formerly 
  worked 
  by 
  the 
  Messrs 
  Hooper) 
  just 
  across 
  the 
  line 
  in 
  

   Essex 
  county 
  less 
  than 
  a 
  mile 
  west 
  of 
  the 
  village 
  of 
  North 
  River 
  

   and 
  four 
  and 
  one-half 
  miles 
  north 
  of 
  the 
  Rogers, 
  mine. 
  As 
  judged 
  

   by 
  their 
  description 
  the 
  type 
  of 
  occurrence 
  appears 
  to 
  be 
  similar 
  

   to 
  that 
  in 
  the 
  Rogers, 
  Oven 
  mountain, 
  and 
  Rexford 
  mines, 
  though 
  

   no 
  mention 
  of 
  the 
  hornblende 
  rims 
  is 
  made. 
  In 
  conclusion 
  they 
  say: 
  

   The 
  origin 
  of 
  this 
  peculiar 
  bed 
  presents 
  an 
  interesting 
  theme. 
  The 
  

   country 
  rock 
  is 
  probably 
  igneous. 
  Its 
  mineralogy 
  and 
  structure 
  favor 
  this 
  

   derivation. 
  The 
  garnet 
  rock 
  must 
  be 
  either 
  an 
  altered 
  form 
  of 
  a 
  very 
  impure 
  

   limestone, 
  or 
  else 
  a 
  very 
  basic 
  igneous 
  rock 
  that 
  was 
  an 
  original 
  sheet 
  or 
  

   dike. 
  The 
  former 
  supposition 
  appeals 
  more 
  strongly 
  to 
  us. 
  

  

  Later 
  Newland 
  2 
  says 
  of 
  the 
  garnet 
  deposits 
  in 
  general 
  that 
  : 
  

   The 
  . 
  garnet 
  is 
  usually 
  associated 
  with 
  a 
  basic 
  hornblende 
  rock 
  or 
  

   amphibolite 
  which 
  forms 
  bands 
  and 
  lenses 
  in 
  the 
  more 
  acid 
  gneiss 
  that 
  

   constitutes 
  the 
  country 
  rock. 
  

  

  In 
  his 
  brief 
  description 
  of 
  the 
  more 
  recently 
  worked 
  garnet 
  

   deposit 
  of 
  northern 
  Essex 
  county 
  he 
  speaks 
  of 
  the 
  " 
  amphibolite 
  

   bands, 
  which 
  have 
  been 
  caught 
  up 
  during 
  the 
  intrusion 
  of 
  the 
  

  

  1 
  17th 
  An. 
  Reo. 
  N. 
  Y. 
  State 
  Geol., 
  1897, 
  pages 
  548-49- 
  

   a 
  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  102, 
  page 
  71. 
  

  

  