﻿164 
  W. 
  T. 
  Schaller 
  — 
  Identity 
  of 
  Hamlinite 
  with 
  Goyazite. 
  

  

  fied 
  by 
  Penfield's 
  later 
  statement* 
  that 
  "hamlinite 
  is 
  almost 
  

   insoluble 
  in 
  boiling 
  dilute 
  hydrochloric 
  acid," 
  and 
  by 
  Bow- 
  

   man's 
  statement! 
  that 
  the 
  " 
  mineral 
  is 
  insoluble 
  in 
  hydro- 
  

   chloric 
  acid." 
  

  

  By 
  correcting 
  these 
  errors 
  in 
  Farrington's 
  table, 
  the 
  main 
  

   supposed 
  differences 
  disappear 
  and 
  the 
  list 
  of 
  similarities 
  of 
  

   the 
  two 
  minerals, 
  as 
  shown 
  below, 
  is 
  sufficient 
  to 
  justify 
  the 
  

   conclusion 
  that 
  hamlinite 
  is 
  identical 
  with 
  goyazite 
  — 
  at 
  least 
  

   until 
  their 
  difference 
  is 
  proven. 
  

  

  Similarities 
  in 
  properties 
  of 
  goyazite 
  and 
  hamlinite, 
  supporting 
  the 
  conclu- 
  

   sion 
  that 
  the 
  two 
  minerals 
  are 
  identical. 
  

  

  Goyazite 
  

   Yellowish 
  white. 
  

  

  More 
  or 
  less- 
  transparent. 
  

   Uniaxial, 
  positive. 
  

   Cleavage, 
  good, 
  basal. 
  

   H 
  = 
  5. 
  

  

  S.G. 
  = 
  3-26 
  

  

  Fuses 
  with 
  difficulty. 
  

   Xot 
  attacked 
  by 
  acids. 
  

   Per 
  cent 
  Al 
  2 
  O 
  s 
  "-{- 
  P 
  2 
  5 
  = 
  65'53. 
  

   Per 
  cent 
  H 
  2 
  (det. 
  by 
  loss 
  on 
  

   ignition?) 
  = 
  16*67. 
  

  

  Hydrous 
  phosphate 
  of 
  alumin- 
  

   ium 
  and 
  strontium. 
  

  

  Hamlinite. 
  

  

  Colorless, 
  yellowish, 
  honey-yel- 
  

   low, 
  reddish 
  brown. 
  

  

  Transparent. 
  

  

  Uniaxial, 
  positive. 
  

  

  Cleavage, 
  good, 
  basal. 
  

  

  H= 
  4-5,4 
  + 
  . 
  

  

  S.G. 
  = 
  3-228, 
  3-2, 
  3*159 
  — 
  3*283, 
  

   3*219 
  — 
  3-266. 
  

  

  Fuses 
  about 
  4. 
  

  

  Insoluble 
  in 
  HC1. 
  

  

  Per 
  cent 
  Ai 
  2 
  3 
  + 
  P 
  a 
  O 
  = 
  62*87. 
  

  

  Loss 
  on 
  ignition 
  (hamlinite 
  from 
  

   Switzerland) 
  — 
  15*6 
  to 
  16*0 
  

   per 
  cent. 
  

  

  Hydrous 
  phosphate 
  of 
  alumin- 
  

   ium 
  and 
  strontium. 
  

  

  :: 
  Penfield, 
  S. 
  L., 
  On 
  the 
  chemical 
  composition 
  of 
  hamlinite 
  and 
  its 
  occur- 
  

   rence 
  with 
  bertrandite 
  at 
  Oxford 
  County, 
  Maine, 
  this 
  Journal 
  (4), 
  iv, 
  313, 
  

   1897. 
  

  

  f 
  Bowman, 
  H. 
  L., 
  On 
  hamlinite 
  from 
  Biennenthal, 
  Switzerland, 
  Mineralog. 
  

   Mag., 
  xiv, 
  391, 
  1907. 
  

  

  