﻿234 
  REPORT 
  UNITED. 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  Ehodochrositb. 
  — 
  Sweet 
  Home 
  mine, 
  Park 
  County, 
  in 
  very 
  beautiful 
  

   specimens, 
  and 
  in 
  the 
  Diadem 
  mine. 
  

  

  RiPiDOLiTE.— 
  San 
  Juan, 
  Colo. 
  Trail 
  Creek, 
  Clear 
  Creek 
  County, 
  Col- 
  

   orado. 
  

  

  EuTiLE. 
  — 
  On 
  the 
  Ute 
  Pass, 
  occurring 
  in 
  quartz. 
  

  

  Sanidite. 
  — 
  Occurs 
  throughout 
  the 
  trachorheites, 
  sometimes 
  in 
  very 
  

   handsome 
  crystals. 
  

  

  Sardonyx. 
  — 
  In 
  Middle 
  Park. 
  

  

  ScHiRMERiTE. 
  — 
  Red 
  Cloud 
  and 
  Cold 
  Spring 
  mine 
  ; 
  Gold 
  Hill. 
  

  

  ScHRBiBERSiTE. 
  — 
  In 
  the 
  Colorado 
  meteorite. 
  

  

  Selenite. 
  — 
  At 
  various 
  localities, 
  in 
  the 
  shales, 
  station 
  35 
  of 
  1873. 
  

   Golden, 
  Colo. 
  Table 
  Mountain. 
  Upper 
  Carboniferous 
  of 
  Eagle 
  River. 
  

   (See 
  Gypsum.) 
  

  

  Semiopal. 
  — 
  At 
  Los 
  Pinos 
  agency. 
  

  

  SiDERiTE. 
  — 
  Crystallized 
  in 
  South 
  Park. 
  Gold 
  Hill, 
  Colo. 
  

  

  Silver. 
  — 
  Native, 
  as 
  wire-silver 
  at 
  the 
  Terrible, 
  Georgetown, 
  at 
  the 
  

   International 
  on 
  Mount 
  McClellan 
  ; 
  as 
  wire-silver 
  in 
  the 
  No 
  Name 
  

   and 
  Caribou 
  mines, 
  at 
  Caribou. 
  In 
  small 
  nuggets 
  and 
  thin 
  scales 
  

   near 
  Fair 
  Play, 
  in 
  Washington 
  Gulch, 
  Homestake 
  lode. 
  Sunshine; 
  

   Gold 
  Hill 
  ; 
  Blue 
  River, 
  Montezuma. 
  

  

  Sinter-calcareous. 
  — 
  See 
  Tufa. 
  

  

  Sinter.— 
  Siliceous, 
  South 
  Park. 
  

  

  Smithsonite. 
  — 
  Jones's 
  mine 
  on 
  sphalerite, 
  near 
  Central, 
  Running 
  lode. 
  

   Black 
  Hawk. 
  

  

  Soda. 
  — 
  Carbonate, 
  from 
  the 
  Hot 
  Springs. 
  

  

  Soda-sulphate. 
  — 
  See 
  Glauber- 
  salt. 
  

  

  Sodium-chloride. 
  — 
  See 
  Halite. 
  

  

  Sphalerite. 
  — 
  Occurs 
  in 
  almost 
  every 
  mine 
  ; 
  only 
  few 
  esceptions 
  take 
  

   place. 
  In 
  the 
  lead-silver 
  mines 
  it 
  is 
  more 
  abundant 
  than 
  in 
  the 
  gold 
  

   mines. 
  It 
  is 
  found 
  in 
  the 
  Winnebago, 
  dark 
  brown, 
  Dallas, 
  Gunnell, 
  

   J. 
  P. 
  Whitney, 
  Kansas, 
  Wood, 
  California, 
  Running, 
  Bobtail, 
  Briggs 
  

   (small 
  quantities 
  in 
  these 
  two), 
  Monte 
  Cristo, 
  and 
  numerous 
  other 
  

   mines 
  in 
  the 
  vicinity 
  of 
  Central. 
  The 
  mines 
  of 
  Georgetown 
  inva- 
  

   riably 
  contain 
  it. 
  The 
  Caribou 
  mines 
  show 
  .at 
  times 
  large 
  quantities 
  

   of 
  the 
  mineral. 
  Station 
  46 
  of 
  1873. 
  Sphalerite, 
  containing 
  cadmium, 
  

   found 
  in 
  several 
  mines 
  near 
  Fair 
  Play. 
  

  

  Spinel. 
  — 
  Crystal 
  mine, 
  Virginia 
  Canon. 
  

  

  Stembergite 
  (iron 
  and 
  silver 
  sulphide). 
  — 
  Georgetown. 
  (Loew.) 
  

  

  Stephanite. 
  — 
  ^^Colorado 
  Central, 
  Georgetown. 
  Moose 
  mine, 
  near 
  Fair 
  

   Play, 
  Montezuma, 
  and 
  other 
  localities. 
  

  

  Stibnite. 
  — 
  Terrible 
  mine, 
  near 
  Georgetown. 
  Boulder 
  County. 
  

  

  Sulphur. 
  — 
  In 
  a 
  small 
  crystal 
  on 
  galenite 
  from 
  the 
  Clifton 
  mine, 
  near 
  

   Central 
  ; 
  found 
  in 
  the 
  Middle 
  Park. 
  Pagosa 
  Springs. 
  

  

  Sylvanite.— 
  In 
  the 
  Red 
  Cloud 
  mine 
  of 
  Gold 
  Hill, 
  occurring 
  in 
  foliated 
  

   masses 
  and 
  thread-like 
  veins. 
  

  

  Talc. 
  — 
  In 
  fine 
  scales 
  among 
  the 
  gangue-rock 
  of 
  the 
  Bobtail 
  and 
  Kan- 
  

   sas, 
  near 
  Central. 
  In 
  light-pink 
  scales 
  in 
  the 
  Silver 
  Hills 
  and 
  Bar- 
  

   ton 
  mines, 
  Hardscrabble 
  district. 
  

  

  Tellurite. 
  — 
  At 
  the 
  Smuggler, 
  in 
  Ballerat, 
  and 
  the 
  John 
  Jay, 
  in 
  Cen- 
  

   tral 
  district, 
  Colo. 
  Tellurite, 
  with 
  the 
  formula 
  Te 
  Oj, 
  is 
  one 
  of 
  Dr. 
  

   F. 
  A. 
  Genth's 
  new 
  species, 
  and 
  I 
  am 
  indebted 
  to 
  him 
  for 
  the 
  oppor- 
  

   tunity 
  of 
  publishing 
  at 
  this 
  date 
  both 
  name 
  and 
  composition. 
  

  

  Tellurium, 
  native.— 
  At 
  the 
  Red 
  Cloud 
  mine 
  of 
  Gold 
  Hill, 
  in 
  crystal- 
  

   line 
  masses, 
  belonging 
  to 
  the 
  hexagonal 
  system. 
  

  

  Tennantite. 
  — 
  Crystals 
  in 
  Buckskin 
  Gulch. 
  Geneva 
  district, 
  Park 
  

   County. 
  

  

  