﻿Derby 
  — 
  Constituents 
  of 
  the 
  Canon 
  Diablo 
  Meteorite. 
  107 
  

  

  spongy, 
  coal-like 
  particles. 
  Both 
  are 
  distinctly 
  crystalline 
  and, 
  

   as 
  shown 
  in 
  the 
  annexed 
  figure, 
  may 
  occur 
  in 
  the 
  same 
  indi- 
  

   vidual. 
  As 
  Cohen 
  has 
  already 
  shown 
  the 
  chemical 
  identity 
  

   of 
  the 
  two 
  types, 
  no 
  further 
  proof 
  seems 
  necessary 
  that 
  schrei- 
  

   bersite 
  and 
  rhabdite 
  belong 
  to 
  the 
  same 
  mineral 
  species, 
  for 
  

   which 
  the 
  former 
  name, 
  being 
  the 
  older, 
  should 
  be 
  retained. 
  

   Diligent 
  search 
  was 
  made 
  without 
  success 
  for 
  crystals 
  that 
  

   would 
  admit 
  of 
  measurement, 
  the 
  rhabdite 
  individuals 
  being 
  

   too 
  minute 
  and 
  those 
  of 
  the 
  schreibersite 
  type 
  too 
  much 
  dis- 
  

   torted 
  and 
  with 
  strongly 
  rounded 
  faces. 
  The 
  general 
  appear- 
  

   ance 
  of 
  the 
  latter 
  type 
  is 
  strongly 
  suggestive 
  of 
  distorted 
  

   crystals 
  of 
  the 
  cubic 
  system, 
  while 
  the 
  rhabdite 
  needles 
  are 
  

   apparently 
  tetragonal 
  prisms, 
  although 
  they 
  might 
  also 
  be 
  dis- 
  

   torted 
  members 
  of 
  the 
  cubic 
  system. 
  On 
  crystals 
  which 
  will 
  

   be 
  described 
  later, 
  separated 
  from 
  the 
  Sao 
  Francisco 
  do 
  Sul 
  

   mass, 
  Dr. 
  Hussak 
  succeeded 
  in 
  proving 
  that 
  the 
  crystalline 
  

   form 
  of 
  schreibersite 
  is 
  really 
  tetragonal. 
  

  

  The 
  third 
  form 
  of 
  phosphide 
  occupies 
  the 
  center 
  of 
  the 
  vein 
  

   mass 
  being 
  enclosed 
  between 
  walls 
  of 
  cohenite. 
  This 
  is 
  mas- 
  

   sive 
  and 
  extremely 
  brittle, 
  breaking 
  with 
  a 
  conchoidal 
  fracture 
  

   and 
  in 
  color 
  and 
  general 
  appearance 
  strongly 
  resembling 
  arseno- 
  

   pyrite." 
  As 
  shown 
  by 
  the 
  analysis 
  below 
  (No. 
  Ill) 
  the 
  compo- 
  

   sition 
  differs 
  from 
  that 
  of 
  the 
  typical 
  schreibersite 
  of 
  the 
  same 
  

   meteorite 
  in 
  the 
  relative 
  proportions 
  of 
  the 
  iron 
  and 
  nickel. 
  

   The 
  phosphorus 
  is 
  also 
  higher 
  in 
  the 
  complete 
  analysis 
  and 
  

   approaches 
  more 
  nearly 
  to 
  what 
  Prof. 
  Cohen 
  considers 
  as 
  the 
  

   normal 
  proportion, 
  but 
  in 
  a 
  separate 
  determination 
  (No. 
  IV) 
  

   the 
  proportion 
  is 
  nearly 
  the 
  same 
  as 
  in 
  the 
  normal 
  granular 
  

   schreibersite 
  with 
  a 
  slight 
  admixture 
  of 
  rhabdite 
  needles, 
  iNos, 
  

   III 
  and 
  IV 
  of 
  the 
  vein 
  matter. 
  In 
  all 
  the 
  material 
  was 
  freed 
  

   from 
  taenite 
  and 
  cohenite 
  by 
  treatment 
  in 
  copper-ammonium 
  

   chloride, 
  and 
  in 
  No. 
  II 
  special 
  care 
  was 
  taken 
  in 
  the 
  washing 
  

   to 
  make 
  sure 
  that 
  the 
  copper 
  found 
  in 
  I 
  and 
  III 
  previously 
  

   executed, 
  really 
  belonged 
  to 
  the 
  substance 
  and 
  did 
  not 
  come 
  

   from 
  this 
  solvent. 
  

  

  

  I. 
  

  

  II. 
  

  

  III. 
  

  

  IV. 
  

  

  p 
  

  

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  12-82 
  

  

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  12-98 
  

  

  Fe 
  ... 
  

  

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  54-34 
  

  

  51-25 
  

  

  66-72 
  

  

  

  Ni 
  . 
  . 
  . 
  

  

  ... 
  31-48 
  

  

  ( 
  33-68 
  

  

  j 
  17-54 
  

  

  

  Co... 
  

  

  ... 
  0-67 
  

  

  i 
  

  

  \ 
  

  

  

  Cu.._ 
  

  

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  Sn.... 
  

  

  

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  tr. 
  

  

  

  99-45 
  99-45 
  98*97 
  

  

  * 
  The 
  cohenite 
  of 
  the 
  walls 
  of 
  the 
  vein 
  also 
  forms 
  a 
  massive 
  crust 
  covered 
  

   however 
  with 
  crystalline 
  faces 
  on 
  its 
  outer 
  surface. 
  

  

  