﻿230 
  REPORT 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  silver, 
  and 
  mercury 
  is 
  found 
  at 
  the 
  Smuggler, 
  Ballerat 
  district, 
  Colo- 
  

   orado. 
  For 
  information 
  on 
  these 
  minerals, 
  1 
  am 
  indebted 
  to 
  Dr. 
  F. 
  A. 
  

   Genth. 
  

  

  Copper. 
  — 
  Native; 
  arborescent 
  in 
  the 
  Gregory 
  lode. 
  Ward 
  district, 
  

   Boulder 
  County 
  ; 
  Bergen's 
  Ranch. 
  

  

  COPPEEASITE.— 
  On 
  the 
  dumps 
  of 
  the 
  Wood 
  Lode 
  and 
  Nevada. 
  

  

  CoVELLiTS. 
  — 
  Mosquito, 
  Central 
  City, 
  Cauon 
  City. 
  (Loew.) 
  

  

  Cuprite. 
  — 
  In 
  crystals, 
  from 
  Sacramento 
  Gulch 
  and 
  from 
  the 
  Sweet 
  

   Home 
  mine. 
  Malachite 
  lode, 
  Bear 
  Creek, 
  Gendhemas 
  lode, 
  Tuciier's 
  

   Gulch. 
  

  

  Dolomite. 
  — 
  From 
  the 
  Four-Mile 
  Creek. 
  

  

  Embolite. 
  — 
  Peru 
  district. 
  Snake 
  River, 
  Gold 
  Hill. 
  

  

  Epidotb. 
  — 
  In 
  crystals, 
  together 
  with 
  garnet 
  on 
  Gunnell 
  Hill, 
  Central; 
  

   in 
  crystals, 
  small, 
  on 
  stations 
  17, 
  43, 
  46, 
  50, 
  and 
  77 
  of 
  1873. 
  A 
  large 
  

   number 
  of 
  the 
  hornblende-dikes 
  traversing 
  the 
  country 
  contain 
  epidote, 
  

   either 
  massive 
  or 
  in 
  small 
  crystals. 
  On 
  the 
  summit 
  of 
  Moulit 
  Bross, 
  

   Lake 
  Creek 
  Canon, 
  Grand 
  Mountain, 
  Elk 
  Mountain 
  Eidge, 
  and 
  all 
  

   through 
  the 
  foot-hills. 
  On 
  Trail 
  Creek. 
  

  

  Pahlerz. 
  — 
  Terrible, 
  Colorado 
  Central, 
  Pelican, 
  and 
  other 
  mines 
  of 
  

   Georgetown 
  -, 
  No 
  Name, 
  Caribou, 
  and 
  others 
  at 
  Caribou, 
  station 
  46 
  

   of 
  1873. 
  

  

  Feldspar. 
  — 
  Occurs 
  in 
  the 
  gangue-rock 
  of 
  a 
  large 
  number 
  of 
  mines 
  

   near 
  Central 
  and 
  Georgetown 
  ; 
  crystals 
  showing 
  the 
  Carlsbad 
  twin- 
  

   system 
  are 
  found 
  in 
  Gregory 
  Hill, 
  Central, 
  in 
  the 
  porphyry, 
  at 
  sta- 
  

   tion 
  46 
  of 
  1873, 
  at 
  Eosita. 
  Twins 
  are 
  also 
  found 
  in 
  the 
  porphyries 
  of 
  

   Gold 
  Hill, 
  on 
  Elk 
  Creek, 
  and 
  at 
  Idaho. 
  Comijare 
  orthoclase. 
  

  

  Fire-clay. 
  — 
  Golden, 
  Ealston, 
  Boulder, 
  &c. 
  

  

  FLOAT-STONE.-*Mammoth 
  lode, 
  Central. 
  

  

  Flos 
  Fbrri.— 
  Vide 
  Aragonite. 
  

  

  Fluorite. 
  — 
  Terrible 
  mine, 
  Georgetown, 
  in 
  the 
  light-green 
  cubes; 
  in 
  

   small 
  crystals 
  and 
  massive, 
  of 
  violet 
  color, 
  on 
  Mount 
  McOlellan 
  and 
  

   Gray's 
  Peak. 
  On 
  Bear 
  Creek 
  ; 
  massive, 
  pink 
  and 
  violet 
  in 
  the 
  Sweet 
  

   Home 
  mine, 
  Clear 
  Creek, 
  and 
  James 
  Creek. 
  

  

  Oalenite. 
  — 
  In 
  narrow 
  seams, 
  fine-grained, 
  Winnebago; 
  feathery 
  in 
  

   the 
  Dallas 
  mine; 
  coarse-grained 
  in 
  the 
  J. 
  P. 
  Whitney, 
  Running, 
  

   Monte 
  Cristo, 
  Forks, 
  and 
  other 
  mines 
  of 
  Gilpin 
  County. 
  In 
  the 
  Col- 
  

   orado 
  Central, 
  Equator, 
  Star, 
  Pelican, 
  Terrible, 
  and 
  others 
  it 
  occurs 
  

   in 
  large 
  quantities. 
  The 
  Cold 
  Stream 
  shows 
  beautiful 
  crystals, 
  com- 
  

   bination 
  of 
  cube 
  and 
  octahedron, 
  with 
  rarely 
  the 
  rhombic 
  dodecahe- 
  

   dron. 
  The 
  International, 
  at 
  an 
  elevation 
  of 
  about 
  12,800 
  feet, 
  has 
  a 
  

   heavy 
  vein 
  of 
  galenite. 
  The 
  No 
  Name, 
  Fourth 
  of 
  July, 
  and 
  other 
  

   mines 
  in 
  Boulder 
  County 
  contain 
  the 
  mineral. 
  The 
  Silver 
  Hill 
  mines 
  

   (fine-grained) 
  and 
  the 
  Eosita 
  Mines 
  in 
  Hardscrabble 
  district; 
  on 
  sta- 
  

   tion 
  46 
  of 
  1873. 
  Hamilton, 
  the 
  mines 
  around 
  Fair 
  Play 
  show 
  crystals 
  j 
  

   the 
  mines 
  of 
  Elk 
  Mountain 
  district, 
  the 
  head 
  of 
  Iowa 
  and 
  of 
  Empire 
  

   Gulch, 
  contain 
  galenite. 
  In 
  small, 
  scattering 
  quantities, 
  it 
  is 
  found 
  

   almost 
  throughout 
  the 
  country. 
  Bear 
  Creek, 
  Guy 
  Gulch. 
  

  

  Garnets. 
  — 
  Crystallized 
  in 
  rhombic 
  dodecahedra 
  and 
  sometimes 
  icosa- 
  

   tetrahedra 
  ; 
  found 
  together 
  with 
  epidote 
  in 
  the 
  dike 
  on 
  Gunnell 
  Hill. 
  

   Closely 
  resemble 
  the 
  garnets 
  from 
  Auerbach, 
  in 
  Germany. 
  In 
  mica 
  

   schist 
  at 
  camp 
  14, 
  and 
  at 
  station 
  22 
  of 
  1873. 
  On 
  Trail 
  Creek, 
  Bergen^ 
  

   &c. 
  ; 
  Montgomery, 
  Bear 
  Creek, 
  Tucker's 
  Gulch. 
  Near 
  the 
  southwest 
  

   corner 
  of 
  Colorado, 
  occurring 
  in 
  drift 
  (almandite). 
  

  

  Glauber 
  salt. 
  — 
  Bear 
  Creek, 
  Smoky 
  Creek. 
  At 
  a 
  number 
  of 
  hot 
  springs 
  

   in 
  Colorado. 
  

  

  Glockerite.— 
  Central 
  City, 
  Idaho 
  Springs. 
  

  

  