﻿44 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  If 
  there 
  were 
  any 
  considerable 
  amount 
  of 
  alumina 
  in 
  the 
  primitive 
  

   minerals 
  it 
  was 
  probably 
  carried 
  off 
  and 
  deposited 
  with 
  the 
  limonite. 
  

   The 
  manner 
  in 
  which 
  this 
  ore 
  originated 
  accounts 
  for 
  its 
  freedom 
  

   from 
  sulphur 
  and 
  phosphorus. 
  

  

  THE 
  SERPENTINE 
  OF 
  RYE 
  AND 
  HOBOKEN. 
  

  

  After 
  studying 
  a 
  large 
  amount 
  of 
  material 
  from 
  these 
  two 
  localities 
  

   the 
  writer 
  is 
  unable 
  to 
  contribute 
  any 
  new 
  facts 
  regarding 
  their 
  

   origin. 
  The 
  outcrops 
  are 
  so 
  far 
  decomposed 
  as 
  to 
  afford 
  no 
  traces 
  of 
  

   the 
  primitive 
  mineral. 
  Dr. 
  A. 
  A. 
  Julien 
  (loc. 
  cit.) 
  mentions 
  his 
  dis- 
  

   covery 
  of 
  traces 
  of 
  hornblende 
  in 
  serpentine 
  from 
  Hoboken. 
  

  

  SERPENTINES 
  ASSOCIATED 
  WITH 
  LIMESTONES. 
  

  

  The 
  distribution 
  of 
  these 
  serpentines 
  has 
  already 
  been 
  described. 
  

   The 
  deposits 
  at 
  Montville, 
  N. 
  ]., 
  are 
  of 
  much 
  interest. 
  Here 
  the 
  ser- 
  

   pentine 
  is 
  derived 
  from 
  segregated 
  masses 
  of 
  diopside 
  enclosed 
  in 
  the 
  

   magnesian 
  limestone. 
  

  

  Mr. 
  G. 
  P. 
  Merrill's 
  monograph 
  on 
  the 
  subject* 
  shows 
  very 
  clearly 
  

   the 
  chemical 
  relations 
  of 
  the 
  primitive 
  mineral 
  and 
  its 
  alteration 
  

   product, 
  and 
  discusses 
  one 
  of 
  the 
  few 
  cases 
  of 
  the 
  formation 
  of 
  ser- 
  

   pentines 
  from 
  the 
  magnesia 
  of 
  a 
  dolomitic 
  limestone. 
  At 
  Mendham 
  

   the 
  serpentine 
  is 
  of 
  similar 
  origin, 
  to 
  that 
  of 
  Montville 
  and 
  pyroxenes 
  

   easy 
  of 
  decomposition 
  occur 
  throughout 
  this 
  belt 
  of 
  limestone 
  of 
  

   which 
  the 
  extent 
  has 
  already 
  been 
  mentioned. 
  

  

  In 
  Westchester 
  County, 
  N. 
  Y., 
  at 
  Pleasantville 
  and 
  elsewhere 
  the 
  

   serpentine 
  is 
  likewise 
  derived 
  from 
  magnesian 
  silicates, 
  chiefly 
  of 
  the 
  

   pyroxene 
  group 
  but 
  occasionally 
  having 
  the 
  characteristics 
  of 
  an 
  

   olivine. 
  

  

  ♦Proceed. 
  U. 
  S. 
  Nat. 
  Mus., 
  Vol. 
  XI. 
  

  

  