﻿Penfield 
  and 
  Foote 
  — 
  Bceblingite, 
  a 
  new 
  Silicate. 
  

  

  413 
  

  

  Art. 
  XLII. 
  — 
  On 
  Rcehlingite, 
  a 
  new 
  Silicate 
  from 
  Franklin 
  

   Furnace, 
  N. 
  «/"., 
  containing 
  Sulphur 
  Dioxide 
  and 
  Lead 
  / 
  

   by 
  S. 
  L. 
  Penfield 
  and 
  H. 
  W. 
  Foote. 
  

  

  Mr. 
  Frank 
  L. 
  Nason, 
  who 
  has 
  been 
  especially 
  interested 
  

   in 
  the 
  geology 
  and 
  mineralogy 
  of 
  the 
  zinc 
  deposits 
  of 
  Frank- 
  

   lin, 
  New 
  Jersey, 
  has 
  recently 
  brought 
  to 
  our 
  attention 
  a 
  

   mineral 
  from 
  the 
  Parker 
  shaft 
  of 
  the 
  New 
  Jersey 
  Zinc 
  Com- 
  

   pany, 
  which 
  owing 
  to 
  its 
  unusual 
  chemical 
  composition 
  is 
  of 
  

   especial 
  interest. 
  The 
  mineral 
  occurs 
  in 
  dense, 
  white, 
  compact 
  

   masses, 
  which 
  consist 
  of 
  an 
  aggregate 
  of 
  minute 
  prismatic 
  

   crystals. 
  These 
  when 
  examined 
  with 
  the 
  microscope 
  show 
  

   parallel 
  extinction 
  and 
  a 
  weak 
  double 
  refraction, 
  but 
  they 
  are 
  

   so 
  minute 
  that 
  the 
  system 
  of 
  crystallization 
  could 
  not 
  be 
  deter- 
  

   mined. 
  The 
  specific 
  gravity 
  is 
  3433 
  ; 
  hardness 
  a 
  trifle 
  under 
  

   3. 
  A 
  chemical 
  analysis 
  of 
  this 
  material 
  by 
  Foote 
  gave 
  the 
  

   following 
  results 
  : 
  

  

  SiO„ 
  23-51 
  

  

  .__ 
  9-01 
  

  

  so,.. 
  

  

  PbO 
  

   MnO 
  

   CaO 
  . 
  

   SrO._ 
  

   R\0 
  , 
  

   Na 
  2 
  

   HO 
  . 
  

  

  31-07 
  

  

  2-46 
  

  

  25-91 
  

  

  1-33 
  

  

  •16 
  

  

  •43 
  

  

  6-36 
  

  

  II. 
  

   23-66 
  

  

  8-99 
  

  

  30-99 
  

  

  2-5J 
  

  

  25-98 
  

  

  1-46 
  

  

  •09 
  

  

  •36 
  

  

  6-35 
  

  

  Average. 
  

  

  

  23-58 
  

  

  393 
  

  

  9 
  00 
  

  

  ■141 
  

  

  31-03 
  

  

  ■139 
  

  

  2'48 
  

  

  •035 
  

  

  25-95 
  

  

  463 
  

  

  1-40 
  

  

  ■014 
  

  

  •13 
  

  

  •001 
  

  

  •40 
  

  

  007 
  

  

  6-35 
  

  

  353 
  

  

  Ratio. 
  

  

  ^•520 
  

  

  5-61 
  

   2-01 
  

   1-99 
  

  

  ■43 
  

  

  5-04 
  

  

  5-0 
  

  

  2- 
  

  

  2- 
  

  

  100-32 
  

  

  The 
  ratio 
  of 
  S0 
  2 
  :PbO:H 
  2 
  is 
  very 
  close 
  to 
  2:2:5, 
  but 
  

   that 
  of 
  the 
  Si0 
  2 
  and 
  the 
  remaining 
  bases 
  to 
  these 
  constituents 
  

   is 
  not 
  so 
  simple. 
  The 
  nearest 
  approach 
  to 
  a 
  simple 
  ratio 
  is 
  

   perhaps 
  Si0 
  2 
  : 
  S0 
  2 
  : 
  PbO 
  : 
  RO 
  : 
  H 
  2 
  = 
  5 
  : 
  2 
  : 
  2 
  : 
  7 
  : 
  5, 
  and 
  this 
  

   gives 
  the 
  rather 
  comjDiicated 
  formula 
  H 
  10 
  Ca 
  7 
  Pb 
  2 
  Si 
  5 
  S 
  2 
  O 
  28 
  . 
  The 
  

   water 
  is 
  driven 
  off 
  at 
  a 
  rather 
  high 
  temperature 
  and 
  is 
  there- 
  

   fore 
  to 
  be 
  regarded 
  as 
  hydroxyl. 
  The 
  formula 
  given 
  above 
  

   may 
  be 
  regarded 
  as 
  a 
  combination 
  of 
  five 
  molecules 
  of 
  a 
  sili- 
  

   cate 
  H 
  2 
  CaSi0 
  4 
  and 
  two 
  of 
  a 
  basic 
  sulphite 
  CaPbS0 
  4 
  or 
  (CaO 
  . 
  

   PbSO 
  s 
  ). 
  The 
  theoretical 
  composition 
  for 
  this 
  formula 
  is 
  given 
  

   below, 
  together 
  with 
  the 
  results 
  of 
  the 
  analysis 
  after 
  substitut- 
  

   ing 
  for 
  MnO, 
  SrO 
  and 
  the 
  alkalies 
  their 
  equivalent 
  of 
  CaO 
  

   and 
  recalculating 
  to 
  100 
  per 
  cent. 
  

  

  