﻿142 
  

  

  CHABAZITE. 
  

  

  (Mineralogy 
  of 
  New- 
  York, 
  page 
  353.) 
  

   This 
  mineral 
  has 
  been 
  found 
  associated 
  with 
  mezotype, 
  in 
  fissures 
  in 
  

   the 
  gneiss, 
  23d 
  street, 
  N. 
  Y. 
  At 
  Haerlem 
  it 
  also 
  occurs 
  in 
  yellow 
  or 
  

   brownish 
  crystals 
  with 
  stilbite 
  and 
  heulandite. 
  

  

  (Mineralogy 
  of 
  New-York, 
  page 
  354.) 
  

   To 
  the 
  particular 
  localities 
  heretofore 
  given, 
  I 
  have 
  to 
  add 
  the 
  occur- 
  

   rence 
  of 
  fine, 
  though 
  small 
  crystals, 
  in 
  the 
  gneiss 
  near 
  the 
  old 
  peniten- 
  

   tiary, 
  in 
  23d 
  street, 
  New- 
  York. 
  

  

  TOURMALINE. 
  

   (Mineralogy 
  of 
  New- 
  York, 
  page 
  356.) 
  

   Crystals 
  with 
  very 
  short 
  prisms, 
  generally 
  resembling 
  fig. 
  360 
  of 
  the 
  

   Mineralogy 
  of 
  New-York, 
  but 
  variously 
  modified, 
  have 
  been 
  found 
  in 
  

   the 
  white 
  limestone, 
  near 
  Amity, 
  in 
  Orange 
  county. 
  

  

  Green 
  and 
  brown 
  crystals 
  of 
  tourmaline 
  are 
  credited 
  to 
  Chester, 
  in 
  

   Warren 
  county. 
  Rep. 
  on 
  the 
  Geol. 
  2d 
  Dist., 
  p. 
  64. 
  

  

  BUCHOLZITE. 
  

   (Mineralogy 
  of 
  New- 
  York, 
  page 
  364.) 
  

  

  In 
  my 
  remarks 
  upon 
  this 
  mineral 
  I 
  stated, 
  that 
  its 
  identity 
  with 
  silli- 
  

   manite, 
  wihich 
  was 
  urged 
  by 
  some 
  mineralogists 
  was 
  inconsistent 
  with 
  

   the 
  difference 
  in 
  chemical 
  composition. 
  This 
  arose 
  chiefly 
  from 
  the 
  

   fact 
  that 
  Muir, 
  under 
  the 
  direction 
  of 
  Dr. 
  T. 
  Thomson, 
  found 
  sillimanite 
  

   to 
  contain 
  a 
  large 
  per 
  centage 
  of 
  zirconia. 
  But 
  the 
  early 
  analysis 
  of 
  

   Bowen 
  and 
  the 
  more 
  recent 
  ones 
  of 
  Prof. 
  Connell, 
  Prof. 
  Norton 
  and 
  

   Erdmann, 
  failed 
  to 
  detect 
  the 
  presence 
  of 
  this 
  earth. 
  The 
  composition 
  

   of 
  a 
  specimen 
  of 
  sillimanite 
  from 
  Chester, 
  Penn., 
  as 
  given 
  by 
  Erd- 
  

   man, 
  is, 
  silica, 
  40-08 
  ; 
  alumina, 
  58-8S 
  ; 
  protoxide 
  of 
  manganese, 
  

   0*74, 
  which 
  approaches 
  to 
  that 
  of 
  andalusite 
  and 
  gives 
  the 
  same 
  for- 
  

   mula. 
  

  

  According 
  to 
  a 
  more 
  recent 
  notice 
  of 
  Dr. 
  T. 
  Thomson, 
  sillimanite 
  

   and 
  fibrolite 
  are 
  identical 
  with 
  bucholzite. 
  The 
  species 
  should 
  be 
  dis- 
  

   tinguished 
  by 
  the 
  name 
  of 
  silicate 
  of 
  alumina. 
  (Phil. 
  Mag. 
  and 
  Ann., 
  

   xxvi, 
  p. 
  536.) 
  Rammelsberg 
  has 
  also 
  shown 
  the 
  identity 
  of 
  bucholzite 
  

   with 
  xenolite 
  of 
  Nordenskiold. 
  

  

  