﻿134 
  

  

  From 
  an 
  article 
  in 
  the 
  Newburgh 
  Telegraph, 
  it 
  appears 
  that 
  the 
  Rev. 
  

   R. 
  G. 
  Armstrong 
  has 
  obtained 
  from 
  a 
  locality 
  in 
  the 
  town 
  of 
  Monroe, 
  

   Orange 
  county, 
  a 
  crystal 
  of 
  pyroxene 
  nearly 
  eight 
  inches 
  in 
  length, 
  and 
  

   fifteen 
  and 
  a 
  half 
  in 
  circumference. 
  This 
  is 
  one 
  of 
  the 
  largest 
  crystals 
  

   of 
  this 
  mineral 
  heretofore 
  noticed. 
  It 
  may 
  be 
  remarked, 
  however, 
  that 
  

   these' 
  specimens 
  from 
  Orange 
  county, 
  although 
  remarkable 
  for 
  their 
  

   size, 
  want 
  the 
  finish 
  which 
  give 
  such 
  beauty 
  to 
  the 
  crystals 
  from 
  some 
  

   other 
  localities. 
  

  

  In 
  regard 
  to 
  the 
  steatitic-pyroxene, 
  the 
  Rensselaeriteof 
  Dr. 
  Emmons, 
  

   I 
  have 
  nothing 
  further 
  to 
  add, 
  except 
  a 
  reference 
  to 
  the 
  localities 
  cited 
  

   in 
  the 
  Report 
  of 
  the 
  Geol. 
  2d 
  Dist., 
  pages 
  350 
  and 
  365. 
  I 
  believe 
  it 
  is 
  

   now 
  generally 
  admitted 
  that 
  the 
  views 
  presented 
  in 
  my 
  Mineralogy 
  

   (p. 
  297) 
  are 
  correct. 
  It 
  is 
  undoubtedly 
  a 
  mixed 
  mineral, 
  containing 
  

   steatite 
  or 
  serpentine 
  in 
  variable 
  proportions, 
  but 
  usually 
  presenting 
  the 
  

   cleavages 
  of 
  pyroxene. 
  It 
  is 
  in 
  fact 
  a 
  pseudomorph 
  on 
  a 
  large 
  scale, 
  

   as 
  it 
  sometimes 
  occurs 
  in 
  mountain 
  masses. 
  

  

  HORNBLENDE. 
  

   (Mineralogy 
  of 
  New-York, 
  page 
  298.) 
  

  

  This 
  species 
  is 
  so 
  abundant, 
  that 
  with 
  the 
  increasing 
  attention 
  paid 
  

   to 
  our 
  mineral 
  resources, 
  new 
  localities 
  must 
  from 
  time 
  to 
  time 
  be 
  dis- 
  

   covered. 
  No 
  remarkable 
  crystalline 
  forms, 
  however, 
  have 
  come 
  to 
  my 
  

   knowledge, 
  since 
  the 
  publication 
  of 
  the 
  Mineralogy 
  of 
  New-York. 
  

   Some 
  researches 
  have 
  been 
  made 
  by 
  Dr. 
  Blum, 
  on 
  the 
  pseudomorphs 
  

   of 
  hornblende 
  and 
  other 
  minerals, 
  which 
  are 
  worthy 
  of 
  being 
  carefully 
  

   studied 
  by 
  the 
  mineralogist. 
  A 
  fact 
  mentioned 
  by 
  him, 
  which 
  particu- 
  

   larly 
  interests 
  us, 
  is 
  that 
  of 
  a 
  greenish 
  white 
  augite, 
  (pyroxene,) 
  in 
  the 
  

   Leonard 
  collection, 
  which 
  he 
  supposes 
  to 
  have 
  undergone 
  a 
  change 
  

   from 
  hornblende. 
  This 
  he 
  says 
  is 
  indicated, 
  both 
  by 
  its 
  structure 
  and 
  

   analysis. 
  See 
  Sill. 
  Jour., 
  xlviii., 
  p. 
  78. 
  

  

  The 
  analysis 
  of 
  a 
  variety 
  of 
  asbestus, 
  (rockwood) 
  from 
  Staten 
  Island, 
  

   gave 
  the 
  following 
  results, 
  viz: 
  Silica, 
  55-20; 
  magnesia, 
  30-73; 
  oxide 
  

   of 
  iron, 
  11*82; 
  water, 
  2*25. 
  The 
  specimen 
  is 
  of 
  the 
  compact 
  kind, 
  

   and 
  had 
  a 
  greenish 
  color, 
  with 
  a 
  kind 
  of 
  cleavage 
  resembling 
  that 
  of 
  

   crystalline 
  hornblende. 
  The 
  above 
  composition 
  is 
  very 
  near 
  that 
  of 
  a 
  

   specimen 
  of 
  rockwood 
  from 
  the 
  Tyrol, 
  analyzed 
  by 
  Dr. 
  T. 
  Thompson. 
  

  

  Mountain 
  cork 
  and 
  mountain 
  leather, 
  usually 
  placed 
  under 
  horn- 
  

   blende, 
  probably 
  belong 
  to 
  some 
  other 
  species, 
  if 
  not 
  themselves 
  dis- 
  

   tinct. 
  

  

  