﻿A 
  

  

  Derby 
  — 
  Constituents 
  of 
  the 
  Canon 
  Diablo 
  Meteorite. 
  103 
  

  

  of 
  massive 
  schreibersite 
  with 
  cohenite 
  ; 
  irregular 
  jagged 
  frag- 
  

   ments 
  resembling 
  the 
  large 
  nncleal 
  piece 
  and 
  bristling 
  with 
  

   needles 
  of 
  rhabdite 
  (zackige 
  Stiieke 
  of 
  Cohen 
  ?) 
  ; 
  taenite 
  ; 
  coarse 
  

   schreibersite 
  and 
  cohenite 
  from 
  the 
  general 
  mass 
  and 
  not 
  from 
  

   the 
  vein 
  (a 
  considerable 
  part 
  of 
  the 
  schreibersite 
  was 
  free 
  but 
  

   the 
  grains 
  of 
  cohenite 
  were 
  so 
  charged 
  with 
  it 
  that 
  no 
  satisfac- 
  

   tory 
  separation 
  of 
  the 
  two 
  could 
  be 
  effected) 
  ; 
  fine 
  magnetic 
  

   residue 
  for 
  the 
  most 
  part 
  schreibersite 
  in 
  the 
  form 
  of 
  rhabdite 
  

   needles 
  but 
  with 
  fine 
  particles 
  of 
  taenite 
  ; 
  granular 
  schreiber- 
  

   site 
  and 
  cohenite, 
  and 
  a 
  black, 
  coal-dust-like 
  residue 
  highly 
  

   charged 
  with 
  rhabdite. 
  The 
  separation 
  could 
  not 
  be 
  completely 
  

   made 
  except 
  for 
  the 
  jagged 
  pieces 
  and 
  coarser 
  taenite, 
  schrei- 
  

   bersite 
  and 
  cohenite. 
  In 
  the 
  finer 
  material 
  the 
  two 
  last 
  were 
  so 
  

   lumped 
  together 
  that 
  neither 
  by 
  sorting 
  nor 
  by 
  gravity 
  or 
  mag- 
  

   netic 
  methods 
  could 
  they 
  be 
  satisfactorily 
  separated. 
  An 
  

   attempt 
  to 
  separate 
  the 
  light, 
  coaly 
  matter 
  by 
  the 
  use 
  of 
  the 
  

   Thoulet 
  solution 
  was 
  only 
  partially 
  successful, 
  as 
  a 
  small 
  amount 
  

   of 
  the 
  black 
  particles 
  were 
  carried 
  down 
  with 
  the 
  heavy 
  metal- 
  

   lic 
  grains 
  and 
  a 
  larger 
  portion 
  of 
  these 
  were 
  retained 
  by 
  the 
  

   spongy, 
  coaly 
  particles. 
  The 
  proportions 
  given 
  below, 
  calcu- 
  

   lated 
  for 
  the 
  dissolved 
  portion 
  after 
  deducting 
  the 
  nucleal 
  

   piece 
  and 
  the 
  vein 
  matter, 
  are 
  therefore 
  only 
  approximate. 
  

  

  Original 
  specimen 
  195 
  grams 
  

  

  Large 
  jagged 
  nucleal 
  piece 
  9'1 
  85 
  5 
  

  

  Yein 
  matter, 
  schreibersite 
  and 
  cohenite 
  2-971 
  

  

  Small 
  jagged 
  pieces 
  1-4105 
  0*78$ 
  

  

  Taenite 
  __. 
  1-872 
  1-02 
  

  

  Coarse 
  schreibersite 
  and 
  cohenite 
  7*5835 
  4*14 
  

  

  Fine 
  magnetic 
  residue 
  mainly 
  schreiber- 
  

   site, 
  in 
  part 
  acicular 
  (rhabdite), 
  with 
  

  

  some 
  taenite 
  and 
  cohenite 
  .._ 
  1-4945 
  0*82 
  

  

  Fine 
  non-magnetic 
  residue 
  with 
  rhabdite 
  0*517 
  0*28 
  

  

  Dissolved 
  _ 
  169*966 
  92*95 
  

  

  100*00 
  

  

  An 
  analysis 
  of 
  100 
  cc 
  of 
  the 
  solution 
  corresponding 
  approxi- 
  

   mately 
  to 
  0*5 
  grams 
  of 
  the 
  meteorite 
  (except 
  for 
  the 
  copper 
  

   determination 
  which 
  was 
  made 
  with 
  500 
  cc 
  ) 
  gave 
  : 
  

  

  Fe 
  91-264$ 
  

  

  Ni 
  and 
  Co 
  _ 
  __. 
  8*252 
  

  

  P._ 
  0-440 
  

  

  C'n 
  -. 
  0-044 
  

  

  100*000 
  

  

  This 
  result 
  agrees 
  fairly 
  well 
  with 
  the 
  composition 
  of 
  kama- 
  

   cite 
  (Fe 
  93*11, 
  Ni 
  and 
  Co 
  6*89) 
  according 
  to 
  the 
  formula 
  Fe 
  14 
  Ki 
  

  

  