﻿132 
  

  

  This 
  gives: 
  magnesia, 
  61-67; 
  water, 
  27-24; 
  carbonic 
  acid, 
  1109;= 
  

   100. 
  It 
  effervesces 
  sensibly 
  in 
  acids, 
  and 
  contains 
  only 
  a 
  minute 
  quan- 
  

   tity 
  of 
  silica. 
  Proceedings 
  of 
  the 
  British 
  Association, 
  for 
  1346. 
  

  

  I 
  cannot 
  but 
  think 
  that 
  the 
  specimen 
  analyzed 
  by 
  Prof. 
  Connell 
  must 
  

   have 
  been 
  impure. 
  His 
  formula 
  is 
  too 
  complex. 
  

  

  A 
  more 
  recent 
  analysis 
  of 
  this 
  mineral 
  by 
  Mr. 
  J. 
  D. 
  Whitney, 
  shows 
  

   it 
  to 
  be 
  a 
  fibrous 
  variety 
  of 
  the 
  hydrate 
  of 
  magnesia, 
  or 
  brucite. 
  It 
  

   afforded 
  him 
  magnesia, 
  62-89 
  ; 
  protoxide 
  of 
  iron, 
  4'65 
  ; 
  carbonic 
  acid, 
  

   4-10; 
  water, 
  2S-36. 
  A 
  small 
  portion 
  of 
  magnesia 
  is 
  replaced 
  by 
  pro- 
  

   toxide 
  of 
  iron. 
  The 
  formula 
  of 
  brucite 
  (Mg 
  H) 
  requires 
  magnesia, 
  

   69-67 
  ; 
  water, 
  30-33. 
  Jour. 
  Bost. 
  Soc. 
  Nut. 
  Hist. 
  1849, 
  p. 
  36. 
  

  

  SERPENTINE. 
  

   (Mineralogy 
  of 
  New-York, 
  page 
  272.) 
  

  

  Subsequent 
  examination 
  has 
  satisfied 
  me 
  of 
  the 
  protean 
  forms 
  of 
  this 
  

   mineral, 
  and 
  would 
  lead 
  me 
  to 
  receive 
  with 
  distrust 
  the 
  dermatin 
  and 
  

   kypholite 
  proposed 
  by 
  Breithaupt, 
  and 
  the 
  hydrophite 
  and 
  picrophyll 
  of 
  

   Svanberg. 
  Marmolite 
  should 
  certainly 
  be 
  united 
  with 
  serpentine, 
  and 
  

   the 
  same 
  may 
  be 
  said 
  of 
  all 
  the 
  minerals 
  included 
  under 
  the 
  general 
  

   name 
  of 
  magnesite. 
  

  

  The 
  supposed 
  crystalline 
  forms 
  of 
  this 
  mineral, 
  are, 
  probably, 
  in 
  most 
  

   cases, 
  pseudomorphs. 
  Some 
  of 
  these 
  have 
  heretofore 
  been 
  noticed. 
  

   Kersten 
  has 
  examined 
  a 
  specimen 
  of 
  serpentine 
  from 
  Schwarzenberg, 
  

   which 
  is 
  remarkable, 
  as 
  being 
  a 
  pseudomorph 
  in 
  the 
  crystalline 
  form 
  of 
  

   garnet. 
  The 
  crystals 
  are 
  blackish 
  green, 
  and 
  contain 
  a 
  mixture 
  of 
  S2-50 
  

   of 
  serpentine, 
  and 
  17-50 
  magnetic 
  iron 
  ore, 
  which 
  can 
  be 
  separated 
  by 
  

   the 
  magnet. 
  The 
  serpentine 
  was 
  composed 
  of 
  silicic 
  acid, 
  41'50 
  ; 
  

   magnesia, 
  40*34 
  ; 
  protoxide 
  of 
  iron, 
  4*10 
  ; 
  oxide 
  of 
  manganese, 
  0-50 
  ; 
  

   soda, 
  0-42 
  ; 
  water, 
  12*87. 
  Berzelius' 
  Annual 
  Report, 
  1S47. 
  

  

  Upon 
  a 
  comparison 
  of 
  specimens, 
  I 
  find 
  that 
  some 
  of 
  the 
  varieties 
  of 
  

   serpentine 
  from 
  Phillipstown, 
  (Heustis' 
  farm) 
  in 
  Putnam 
  county, 
  closely 
  

   resemble 
  those 
  from 
  Smithfield, 
  Rhode 
  Island, 
  and 
  which 
  are 
  usually 
  

   labelled 
  nephrite. 
  

  

  CHONDKODITE. 
  

  

  (Mineralogy 
  of 
  New-York, 
  page 
  281.) 
  

  

  Two 
  new 
  localities 
  of 
  this 
  mineral 
  are 
  to 
  be 
  added 
  to 
  those 
  hereto- 
  

   fore 
  given. 
  The 
  one 
  in 
  Schroon, 
  Essex 
  county, 
  and 
  the 
  other 
  in 
  Car- 
  

   mel, 
  Putnam 
  countv. 
  

  

  