﻿72 
  Loughlin 
  and 
  Schaller 
  — 
  Crandallite, 
  a 
  New 
  Mineral. 
  

  

  Pyrognostics. 
  — 
  Heated 
  in 
  a 
  blowpipe 
  flame, 
  crandallite 
  

   decrepitates 
  somewhat, 
  then 
  exfoliates 
  slightly 
  and 
  fuses 
  toan 
  

   opaque 
  white 
  enamel, 
  coloring 
  the 
  flame 
  intermittently 
  a 
  pale 
  

   green 
  (phosphorous) 
  with 
  occasional 
  flashes 
  of 
  red 
  (calcium, 
  

   strontium). 
  In 
  a 
  closed 
  tube 
  decrepitation 
  occurs 
  with 
  the 
  

   liberation 
  of 
  water. 
  Soluble 
  in 
  acids. 
  

  

  Chemical 
  composition. 
  — 
  The 
  results 
  of 
  the 
  analysis 
  are 
  as 
  

   follows, 
  the 
  material 
  being 
  dissolved 
  in 
  acids 
  and 
  the 
  insoluble 
  

   residue 
  Altered 
  off 
  and 
  weighed. 
  The 
  insoluble 
  residue 
  con- 
  

   sisted 
  of 
  97 
  per 
  cent 
  Si0 
  2 
  , 
  the 
  remainder 
  being 
  barite 
  with 
  

   traces 
  of 
  sulphides. 
  

  

  Analysis 
  of 
  Crandallite. 
  [W. 
  T. 
  Schaller, 
  analyst.] 
  

  

  Ratios 
  

  

  0-379 
  1-96 
  or 
  2X0-98 
  

  

  •178 
  *92 
  or 
  1 
  XO'92 
  

  

  •215 
  1-11 
  or 
  lXl'll 
  

  

  1-048 
  5-43 
  or 
  5X1*09 
  

  

  100-40 
  100-40 
  

  

  An 
  inconclusive 
  test 
  for 
  rare 
  earths 
  (probably 
  cerium) 
  

   seemed 
  to 
  show 
  their 
  presence 
  to 
  a 
  slight 
  extent 
  but 
  the 
  iden- 
  

   tification 
  was 
  not 
  verified. 
  Barium 
  could 
  not 
  be 
  detected 
  in 
  

   the 
  acid-soluble 
  part, 
  neither 
  was 
  any 
  barium 
  sulphate 
  precip- 
  

   itated 
  on 
  solution 
  of 
  the 
  mineral. 
  The 
  barium 
  sulphate 
  in 
  the 
  

   insoluble 
  residue 
  was 
  in 
  relatively 
  large 
  cleavage 
  plates, 
  plainly 
  

   derived 
  from 
  the 
  mineral 
  barite. 
  

  

  Genetic 
  relations. 
  — 
  The 
  ratios 
  of 
  the 
  analysis 
  yield 
  the 
  

   formula 
  Ca0.2Al 
  2 
  3 
  .P 
  2 
  5 
  .5H 
  2 
  with 
  slight 
  replacement 
  of 
  

   CaO 
  bv 
  SrO 
  and 
  MgO, 
  and 
  of 
  P 
  2 
  5 
  bv 
  S0 
  3 
  [or 
  more 
  exactly 
  

   of 
  (HP0 
  4 
  )"by(S0 
  4 
  )"]. 
  

  

  This 
  type 
  of 
  formula 
  is 
  slightly 
  different 
  from 
  that 
  of 
  goya- 
  

   zite 
  (hamlinite), 
  

  

  Crandallite 
  2CaO.4Al 
  2 
  O 
  3 
  .2P 
  2 
  O 
  5 
  .10H 
  2 
  O 
  

   Goyazite 
  2Sr0.3Al 
  2 
  3 
  .2P 
  2 
  5 
  .7H 
  2 
  

  

  but 
  is 
  of 
  the 
  same 
  type 
  as 
  that 
  of 
  gorceixite. 
  

  

  Crandallite 
  Ca0.2Al 
  2 
  3 
  .P 
  2 
  5 
  .5H 
  2 
  

   Gorceixite 
  Ba0.2Al 
  2 
  O 
  s 
  .P 
  2 
  5 
  .5H 
  2 
  

  

  

  

  Same 
  with 
  

  

  

  

  

  insoluble 
  

  

  

  

  Analysis 
  

  

  deducted 
  

  

  

  In 
  sol. 
  

  

  35-13 
  

  

  

  

  A1A 
  

  

  25-16 
  

  

  38-71 
  

  

  0-379 
  

  

  CaO 
  

  

  4-88 
  

  

  7-50 
  

  

  •134 
  

  

  SrO 
  

  

  1-44 
  

  

  2-21 
  

  

  •021 
  

  

  MgO 
  

  

  0-61 
  

  

  0-94 
  

  

  •023 
  

  

  PA 
  

  

  17-61 
  

  

  27-09 
  

  

  •191 
  

  

  so 
  3 
  

  

  2-47 
  

  

  3-80 
  

  

  •047 
  

  

  H 
  2 
  0- 
  

  

  0-84 
  

  

  1-29 
  

  

  •072 
  

  

  H 
  2 
  + 
  

  

  12-26 
  

  

  18-86 
  

  

  1-048 
  

  

  