﻿127 
  

  

  (Mineralogy 
  of 
  New-York, 
  page 
  237.) 
  

  

  Beautiful 
  and 
  very 
  perfect 
  crystals 
  of 
  selenite, 
  have 
  been 
  obtained 
  

   from 
  the 
  deep 
  boring 
  at 
  Lockpit, 
  in 
  Wayne 
  county. 
  They 
  are 
  found 
  

   imbedded 
  in 
  gypseous 
  marl, 
  which 
  contains 
  chlorides 
  of 
  sodium 
  and 
  

   magnesium 
  ; 
  the 
  whole 
  probably 
  formed 
  by 
  the 
  evaporation 
  of 
  the 
  brine. 
  

   The 
  crystals 
  are 
  six-sided 
  prisms, 
  from 
  half 
  a 
  line 
  to 
  two 
  lines 
  in 
  diam? 
  

   eter, 
  and 
  from 
  one-fourth 
  to 
  five-eights 
  of 
  an 
  inch 
  in 
  length. 
  They 
  are 
  

   extended 
  in 
  the 
  direction 
  of 
  //; 
  P 
  on/, 
  124° 
  41' 
  43" 
  ; 
  /on/, 
  110° 
  

   36' 
  34". 
  They 
  frequently 
  exhibit 
  the 
  primary 
  plane 
  M. 
  

  

  J 
  

  

  A 
  careful 
  trial 
  yielded 
  21*20 
  per 
  cent 
  of 
  watar. 
  

  

  Several 
  localiti.es 
  of 
  this 
  mineral 
  occur, 
  according 
  to 
  Prof. 
  Mather. 
  

   in 
  the 
  First 
  Geological 
  District, 
  but 
  uone 
  of 
  them 
  are 
  of 
  special 
  import- 
  

   ance. 
  See 
  Mather's 
  Rep., 
  p. 
  84. 
  

  

  APATITE. 
  

  

  (Mineralogy 
  of 
  New- 
  York, 
  page 
  239.) 
  

  

  To 
  the 
  localities 
  of 
  this 
  interesting 
  mineral, 
  I 
  have 
  to 
  add 
  its 
  occur- 
  

   rence 
  in 
  Putnam 
  Valley, 
  Putnam 
  county 
  ; 
  for 
  which 
  discovery 
  we 
  are 
  

   indebted 
  to 
  Mr. 
  Cyrus 
  Fountain, 
  of 
  Peekskill. 
  

  

  In 
  the 
  Mineralogy 
  of 
  New- 
  York, 
  I 
  noticed 
  the 
  -occurrence 
  of 
  apatite 
  

   as 
  an 
  associate 
  of 
  magnetic 
  iron 
  ore, 
  at 
  several 
  mines 
  in 
  Essex 
  county. 
  

   Prof. 
  Emmons 
  states 
  that 
  it 
  is 
  also 
  found 
  similarly 
  at 
  the 
  Rutgers 
  mine, 
  

   in 
  Clinton 
  county. 
  It 
  is 
  sometimes 
  in 
  large 
  crystals 
  upon 
  the 
  walls 
  of* 
  

   the 
  vein, 
  but 
  it 
  is 
  so 
  extremely 
  brittle 
  that 
  it 
  will 
  be 
  very 
  difficult 
  to 
  

   procure 
  it 
  in 
  a 
  good 
  form 
  for 
  the 
  cabinet. 
  Amer. 
  Quart. 
  Jour., 
  i. 
  p. 
  60. 
  

  

  Some 
  difference 
  of 
  opinion 
  still 
  prevails, 
  in 
  regard 
  to 
  the 
  modes 
  in 
  

   which 
  apatite 
  has 
  been 
  formed. 
  Mr. 
  J. 
  D. 
  Dana 
  maintains 
  {Sill. 
  Jour. 
  

   xlvii. 
  135,) 
  that 
  the 
  apatite 
  found 
  in 
  white 
  limestones, 
  although 
  now 
  in 
  

   supurbly 
  finished 
  crystals, 
  originated 
  from 
  organic 
  structures, 
  from 
  co- 
  

   rals, 
  which, 
  after 
  being 
  enclosed 
  in 
  their 
  rocky 
  prison, 
  were 
  exposed 
  to 
  

   intense 
  heat, 
  and 
  hence 
  were 
  decomposed, 
  &c. 
  Dr. 
  Emmons 
  objects 
  

   to 
  this 
  view, 
  as 
  a 
  general 
  theory 
  of 
  the 
  formation, 
  and 
  in 
  support 
  of 
  his 
  

  

  