﻿Clarice 
  and 
  Steiger 
  — 
  Experiments 
  ivith 
  Pectolite, 
  etc. 
  249. 
  

  

  simple 
  or 
  complex, 
  the 
  hydrogen 
  as 
  well 
  as 
  the 
  zinc 
  must 
  be 
  

   represented 
  as 
  present 
  in 
  at 
  least 
  two 
  modes 
  of 
  combination 
  ; 
  a 
  

   condition 
  of 
  which, 
  if 
  it 
  exists, 
  some 
  evidence 
  should 
  be 
  

   attainable. 
  Our 
  experiments 
  upon 
  calamine 
  have 
  had 
  this 
  

   point 
  in 
  view 
  ; 
  and 
  we 
  have 
  sought 
  to 
  ascertain 
  whether 
  water 
  

   or 
  zinc 
  could 
  be 
  split 
  off 
  in 
  separately 
  recognizable 
  fractions. 
  

   Our 
  results, 
  in 
  the 
  main, 
  have 
  been 
  negative, 
  and 
  tend 
  towards 
  

   the 
  support 
  of 
  the 
  usual 
  formula; 
  but 
  the 
  data 
  are 
  not 
  conclu- 
  

   sive, 
  although 
  they 
  seem 
  to 
  be 
  worthy 
  of 
  record. 
  

  

  The 
  beautiful, 
  white 
  calamine 
  from 
  Franklin, 
  X. 
  J., 
  was 
  

   selected 
  for 
  study, 
  and 
  gave 
  the 
  subjoined 
  composition 
  : 
  

  

  SiO 
  

  

  Analysis. 
  

  

  24-15 
  

  

  •IQ 
  

  

  67'55 
  

  

  ^12 
  

  

  7 
  "95 
  

  

  Fractional 
  water. 
  

   At 
  100° 
  

  

  •27 
  

  

  Al 
  , 
  Fe 
  - 
  . 
  

  

  " 
  180° 
  - 
  -. 
  -. 
  

  

  .. 
  '22 
  

  

  ZnO 
  " 
  - 
  

  

  " 
  250° 
  ._- 
  

  

  ._ 
  -75 
  

  

  CaO 
  

  

  " 
  300° 
  

  

  ._ 
  •BS 
  

  

  HO 
  . 
  . 
  .. 
  

  

  Incipient 
  red 
  heat... 
  

   Fall 
  red 
  heat 
  

  

  . 
  4^46 
  

  

  

  

  .- 
  1-37 
  

  

  99-96 
  

  

  7-95 
  

  

  Here 
  no 
  clear 
  and 
  definite 
  fractionation 
  of 
  the 
  water 
  is 
  

   recognizable, 
  at 
  least 
  of 
  such 
  a 
  character 
  as 
  to 
  suggest 
  any 
  other 
  

   than 
  the 
  ordinary 
  formula 
  for 
  calamine. 
  

  

  Upon 
  boiling 
  powdered 
  calamine 
  with 
  water, 
  practically 
  

   nothing 
  went 
  into 
  solution, 
  but 
  by 
  boiling 
  with 
  the 
  solution 
  of 
  

   sodium 
  carbonate, 
  0'25 
  per 
  cent 
  of 
  silica 
  was 
  dissolved. 
  After 
  

   ignition 
  at 
  a 
  red 
  heat, 
  only 
  0-14 
  per 
  cent 
  of 
  silica 
  became 
  

   soluble 
  in 
  sodium 
  carbonate, 
  and 
  after 
  blasting, 
  only 
  0^24:. 
  In 
  

   these 
  experiments 
  a 
  very 
  little 
  zinc 
  was 
  dissolved 
  also 
  ; 
  but 
  

   there 
  was 
  no 
  evidence 
  that 
  any 
  breaking 
  up 
  of 
  the 
  mineral 
  

   into 
  distinguishable 
  fractions 
  had 
  occurred. 
  In 
  a 
  hot 
  ten 
  per 
  

   cent 
  solution 
  of 
  caustic 
  soda 
  both 
  the 
  fresh 
  and 
  the 
  ignited 
  

   calamine 
  dissolve 
  almost 
  completely; 
  but 
  boiling 
  with 
  aqueous 
  

   ammonia 
  seems 
  to 
  leave 
  the 
  mineral 
  practically 
  unattached. 
  

   All 
  experiments 
  aiming 
  to 
  extract 
  a 
  definite 
  fraction 
  of 
  zinc 
  

   while 
  leaving 
  a 
  similar 
  fraction 
  behind, 
  resulted 
  negatively. 
  

  

  By 
  heating 
  with 
  dry 
  ammonium 
  chloride, 
  calamine 
  is 
  vigor- 
  

   ously 
  attacked, 
  and 
  gains 
  in 
  w^eight 
  by 
  absorption 
  of 
  chlorine. 
  

   In 
  two 
  experiments 
  the 
  mineral 
  was 
  intimately 
  mixed 
  with 
  

   three 
  times 
  its 
  weight 
  of 
  powdered 
  salammoniac, 
  and 
  heated 
  in 
  

   an 
  air-bath 
  for 
  several 
  hours 
  to 
  a 
  temperature 
  somewhat 
  over 
  

   400°. 
  A 
  large 
  part 
  of 
  the 
  residue 
  was 
  soluble 
  in 
  water, 
  and 
  

   the 
  percentage 
  of 
  this 
  portion, 
  together 
  with 
  the 
  percentage 
  

   increase 
  in 
  weight, 
  is 
  given 
  below. 
  

  

  