﻿G. 
  Smith 
  — 
  Dyscrasite 
  in 
  Australia. 
  279 
  

  

  alteration 
  of 
  the 
  former 
  and 
  was 
  confined 
  to 
  the 
  upper 
  

   levels. 
  The 
  chloro-antimoniate 
  occurred 
  in 
  lumps 
  more 
  

   or 
  less 
  detached, 
  sometimes 
  containing 
  a 
  core 
  of 
  unal- 
  

   tered 
  dyscrasite; 
  perfect 
  pseudomorphs 
  were 
  occasion- 
  

   ally 
  seen. 
  Several 
  tons 
  were 
  found 
  including 
  two 
  pieces 
  

   weighing 
  475 
  and 
  over 
  700 
  lbs. 
  respectively. 
  Analyses 
  

   showed 
  that 
  it 
  varied 
  from 
  about 
  45% 
  to 
  75% 
  of 
  silver, 
  

   the 
  average 
  being 
  70%. 
  

  

  Some 
  of 
  the 
  lumps 
  of 
  dyscrasite 
  were 
  large, 
  possibly 
  

   up 
  to 
  30 
  cwts. 
  when 
  in 
  situ. 
  Being 
  generally 
  " 
  frozen' 
  ' 
  

   to 
  the 
  footwall 
  it 
  had 
  to 
  be 
  blasted 
  out, 
  which 
  fractured 
  

   the 
  larger 
  pieces. 
  The 
  largest 
  lump 
  shipped 
  weighed 
  

   16 
  cwts. 
  after 
  it 
  had 
  been 
  broken 
  as 
  small 
  as 
  possible 
  for 
  

   shipment; 
  it 
  was 
  known 
  as 
  the 
  "Turtle 
  Slug" 
  and 
  was 
  

   originally 
  portion 
  of 
  a 
  larger 
  mass. 
  It 
  was 
  crystalline 
  

   and 
  quite 
  free 
  from 
  any 
  foreign 
  mineral. 
  Its 
  assay 
  

   value 
  was 
  about 
  80%. 
  When 
  smelted 
  it 
  realized 
  £4,375. 
  

   Many 
  other 
  lumps 
  ranging 
  from 
  10 
  cwts. 
  downwards 
  — 
  

   some 
  of 
  which 
  had 
  been 
  parts 
  of 
  larger 
  masses 
  — 
  were 
  

   found. 
  

  

  The 
  largest 
  deposit 
  of 
  ore 
  was 
  confined 
  to 
  a 
  small 
  area, 
  

   and 
  included 
  127 
  cwts. 
  of 
  dyscrasite 
  which, 
  including 
  a 
  

   little 
  ore 
  and 
  gangue, 
  averaged 
  as 
  smelted 
  nearly 
  70% 
  

   of 
  silver. 
  This 
  accounted 
  for 
  about 
  30% 
  of 
  the 
  total 
  

   silver 
  contents 
  of 
  that 
  particular 
  deposit. 
  Later 
  discov- 
  

   eries 
  in 
  calcite 
  yielded 
  higher 
  values 
  and 
  the 
  general 
  

   average 
  was 
  thereby 
  raised 
  considerably. 
  One 
  interest- 
  

   ing 
  deposit 
  of 
  the 
  dyscrasite 
  showed 
  that 
  vughs 
  in 
  crys- 
  

   tallised 
  siderite 
  had 
  been 
  filled 
  and 
  the 
  crystallisation 
  

   was 
  beautifully 
  reproduced. 
  The 
  largest 
  piece 
  of 
  this 
  

   kind 
  weighed 
  87 
  lbs., 
  the 
  assay 
  value 
  being 
  about 
  83% 
  

   of 
  silver. 
  Many 
  careful 
  tests 
  were 
  made 
  and 
  the 
  dyscra- 
  

   site 
  was 
  always 
  found 
  to 
  be 
  pure. 
  The 
  commonest 
  types 
  

   were 
  72% 
  and 
  84% 
  (Ag 
  3 
  Sb 
  & 
  Ag 
  6 
  Sb) 
  followed 
  by 
  Ag 
  4 
  Sb, 
  

   Ag 
  5 
  Sb, 
  Ag 
  9 
  Sb, 
  Ag 
  1>2 
  Sb, 
  Ag 
  18 
  Sb. 
  

  

  The 
  total 
  quantity 
  of 
  dyscrasite 
  found 
  would 
  be 
  in 
  

   excess 
  of 
  10 
  tons. 
  Very 
  fine 
  arborescent 
  crystallizations 
  

   were 
  met 
  with 
  besides 
  beautiful 
  crystalline 
  masses 
  which 
  

   were 
  readily 
  shattered 
  into 
  innumerable 
  crystalline 
  

   grains 
  which 
  possessed 
  a 
  brilliant 
  tin 
  white 
  lustre; 
  un- 
  

   fortunately 
  these 
  unique 
  specimens 
  were 
  all 
  dispatched 
  

   to 
  London 
  where 
  the 
  rich 
  ore 
  was 
  smelted. 
  

  

  The 
  crystallizations 
  in 
  calcite 
  were 
  exceptionally 
  beau- 
  

   tiful 
  and 
  were 
  the 
  richest 
  kinds 
  met 
  with. 
  

  

  