﻿TT. 
  F. 
  Hillebrand 
  — 
  Miner 
  alogical 
  Notes. 
  297 
  

  

  Te 
  73-43 
  

  

  Ni 
  - 
  .. 
  20'98 
  

  

  Ag 
  4-08 
  

  

  Pb 
  -72 
  

  

  99-21 
  

  

  from 
  which, 
  after 
  deducting 
  hessite, 
  altaite, 
  and 
  free 
  tellurium, 
  

   he 
  deduces 
  the 
  formula 
  Si^TCg, 
  requiring 
  Te 
  7649 
  and 
  M 
  

   23-51. 
  

  

  The 
  difference 
  between 
  this 
  and 
  my 
  own 
  analyses 
  is 
  too 
  

   great 
  to 
  admit 
  of 
  bringing 
  them 
  into 
  accordance, 
  yet 
  I 
  am 
  

   indisposed 
  to 
  believe 
  that 
  two 
  minerals 
  are 
  represented, 
  for 
  

   both 
  occurrence 
  and 
  appearance 
  are 
  opposed 
  to 
  such 
  a 
  view. 
  

   The 
  present 
  mineral 
  is 
  from 
  the 
  same 
  source 
  as 
  Genth's, 
  its 
  

   physical 
  characteristics, 
  so 
  far 
  as 
  ascertainable, 
  coincide 
  with 
  

   those 
  of 
  melonite, 
  and 
  it 
  is 
  called 
  melonite 
  by 
  the 
  people 
  at 
  the 
  

   mine. 
  Melonite 
  was 
  considered 
  by 
  Genth 
  to 
  be 
  hexagonal 
  on 
  

   the 
  strength 
  of 
  its 
  eminent 
  cleavage 
  and 
  the 
  observation 
  of 
  a 
  

   single 
  microscopic 
  six-sided 
  plate. 
  Mineralogically 
  a 
  hexagonal 
  

   form 
  in 
  the 
  pyrite 
  group, 
  assuming 
  this 
  mineral 
  to 
  belong 
  

   there, 
  is 
  not 
  to 
  be 
  looked 
  for, 
  but 
  the 
  evidence 
  in 
  favor 
  of 
  hexa- 
  

   gonal 
  crystallization 
  is 
  too 
  meager 
  to 
  permit 
  this 
  to 
  be 
  used 
  as 
  

   an 
  argument 
  one 
  way 
  or 
  another. 
  

  

  Coloradoite 
  ? 
  

  

  One 
  small 
  specimen 
  from 
  the 
  ISTorwegian 
  mine 
  showed 
  in 
  

   dolomite, 
  petzite, 
  hessite, 
  and 
  a 
  mercury 
  telluride. 
  Superfi- 
  

   cially 
  the 
  latter 
  was 
  not 
  to 
  be 
  distinguished 
  from 
  the 
  accom- 
  

   panying 
  petzite 
  and 
  hessite, 
  and 
  it 
  was 
  in 
  insufficient 
  amount 
  to 
  

   admit 
  of 
  analysis 
  for 
  the 
  determination 
  of 
  its 
  formula. 
  It, 
  

   however, 
  gave 
  the 
  tests 
  noted 
  by 
  Genth 
  for 
  the 
  original 
  colo- 
  

   radoite 
  from 
  Colorado, 
  and 
  in 
  addition 
  the 
  following 
  charac- 
  

   teristic 
  may 
  be 
  noted. 
  On 
  heating 
  with 
  strong 
  nitric 
  acid 
  it 
  

   becomes 
  coated 
  with 
  a 
  white 
  insoluble 
  salt 
  of 
  mercury, 
  which 
  

   retards 
  further 
  action 
  of 
  the 
  acid. 
  

  

  It 
  is 
  in 
  all 
  probability 
  coloradoite, 
  and 
  jf 
  so 
  this 
  is 
  its 
  second 
  

   known 
  locality 
  of 
  occurrence, 
  though 
  I 
  have 
  been 
  informed 
  

   that 
  a 
  mercury 
  telluride 
  has 
  recently 
  been 
  found 
  in 
  Western 
  

   Australia. 
  

  

  Petzite. 
  

  

  One 
  specimen 
  of 
  petzite 
  from 
  the 
  Norwegian 
  mine 
  gave 
  

   such 
  an 
  abundance 
  of 
  pure 
  material 
  that 
  an 
  analysis 
  seemed 
  

   desirable. 
  

  

  