﻿140 
  

  

  Silica, 
  

  

  Lime, 
  

  

  Soda, 
  

  

  Potash, 
  

  

  Alumina, 
  

  

  Water, 
  

  

  Isle 
  Royale 
  

  

  

  I. 
  

  

  II. 
  

  

  53-45 
  

  

  55-66 
  

  

  31-21 
  

  

  32 
  86 
  

  

  7-37 
  

  

  7-31 
  

  

  trace. 
  

  

  

  4-94 
  

  

  1-45 
  

  

  272 
  

  

  2-72 
  

  

  Stellite 
  froi 
  

  

  m 
  Bergen 
  Hill. 
  

  

  III. 
  

  

  IV. 
  

  

  54-00 
  

  

  55-00 
  

  

  32-10 
  

  

  32-53 
  

  

  8-89 
  

  

  9-72 
  

  

  trace. 
  

  

  

  1-90 
  

  

  1-10 
  

  

  2-96 
  

  

  2-75 
  

  

  99-69 
  100-00 
  99-S5 
  101-10 
  

  

  The 
  stellite 
  of 
  Thomson, 
  Mr. 
  Whitney 
  observes, 
  was 
  probably 
  im- 
  

   pure 
  pectolite, 
  and 
  he 
  refers 
  Thomson's 
  wollastonite 
  to 
  the 
  same 
  species. 
  

  

  The 
  above 
  analyses 
  do 
  not 
  differ 
  much 
  from 
  mine, 
  of 
  the 
  Bergen 
  

   Hill 
  mineral, 
  except 
  in 
  the 
  presence 
  of 
  soda, 
  which 
  I 
  still 
  think 
  may, 
  in 
  

   some 
  specimens, 
  be 
  replaced 
  by 
  magnesia. 
  They 
  confirm 
  the 
  results 
  

   of 
  Von 
  Kobell, 
  and 
  of 
  my 
  own 
  analysis, 
  in 
  regard 
  to 
  the 
  presence 
  of 
  

   water. 
  

  

  PHAKOLITE. 
  

  

  This 
  mineral, 
  which 
  has 
  been 
  usually 
  considered 
  as 
  a 
  variety 
  ofcha- 
  

   bazite 
  has 
  been 
  found 
  by 
  Mr. 
  Alger, 
  among 
  specimens 
  of 
  minerals 
  from 
  

   New- 
  York 
  Island. 
  The 
  crystals 
  are 
  very 
  perfect 
  double 
  six-sided 
  

   pyramids, 
  implanted 
  on 
  carbonate 
  of 
  lime. 
  They 
  have 
  a 
  wax 
  yellow 
  

   color, 
  a 
  waxy 
  lustre, 
  and 
  are 
  transparent. 
  They 
  show 
  the 
  incipient 
  

   modifications, 
  from 
  the 
  primary 
  rhombohedron, 
  to 
  the 
  six-sided 
  pyramid. 
  

   Memoirs 
  of 
  the 
  Boston 
  Nat. 
  Hist. 
  Soc, 
  ii., 
  p. 
  86. 
  

  

  It 
  may 
  be 
  remarked 
  that 
  phakolite, 
  although 
  it 
  has 
  a 
  primary 
  form 
  

   differing 
  only 
  a 
  few 
  minutes 
  in 
  its 
  angles, 
  compared 
  with 
  that 
  of 
  chaba- 
  

   zite, 
  is 
  somewhat 
  unlike 
  in 
  its 
  chemical 
  composition. 
  Breithaupt 
  sup- 
  

   poses 
  it 
  to 
  be 
  a 
  distinct 
  species 
  ; 
  while 
  Rammelsberg, 
  from 
  his 
  own 
  

   analysis, 
  is 
  disposed 
  to 
  regard 
  it 
  as 
  a 
  mixture 
  of 
  acadiolite 
  andscolesite, 
  

   with 
  an 
  additional 
  atom 
  of 
  water. 
  

  

  HEULANDITE. 
  

  

  (Mineralogy 
  of 
  New-York, 
  page 
  346.) 
  

  

  Well 
  defined 
  crystals 
  of 
  heulandite, 
  with 
  a 
  form 
  similar 
  to 
  fig. 
  335, 
  

   of 
  the 
  Mineralogy 
  of 
  New- 
  York, 
  have 
  been 
  found 
  with 
  stilbite, 
  in 
  the 
  

   fissures 
  of 
  gneiss, 
  in 
  23d 
  street, 
  New- 
  York. 
  

  

  