268 GEOLOGICAL SUEVEY OP THE TEERITOKIES. 



Feldspar. In many varieties in the schists near Montgomery.* Labra- 

 dorite in fine crystals near Montgomery.* Ortlioclase, fllesh-red in 

 color, from the foot-hill range. Good crystals of pale pink color in the 

 granites of the Sawatch range. Amozenstone, good crystals, from 

 Pike's Peak and Cheyenne Mountain. Sanidine in the trachytes of 

 South Park and Buffalo Peaks. 



Fluorite.* Massive and crystallized, pink and violet colors, from Sweet- 

 Home mine. 



Garnet. In schists, near Montgomery. 



Galenite. Near Silver Heels, above Hamilton. In all the mines, in 

 limestones and sandstones, near Mount Lincoln, Mount Bross, and 

 Horseshoe Mountain, assaying from $3 to $200 per ton in silver, and 

 as high as $120 in gold.* It occurs in simple and modified cubes and 

 twins at the Homestake mine, near Tennessee Pass ; in the mines of 

 the Elk Mountain district, at the head of Empire Gulch, and Iowa 

 Gulch; 



Graphite.* In limestones on Silver Heels Mountain, containing much 

 iron and earthy matter. 



Gold. In the placer-mines of Tarryall Creek; in the placer and lead 

 mines near Fair Play; occurring in laminse, flat grains and shot-like, 

 and rarely in imperfect crystals;* in plates and laminse at the Printer 

 Boy mine, at the head of California Gulch, near Ore City ; in the 

 placer-mines of Washington Gulch, in the Elk Mountains ; in Union 

 Park, east of the Gunnison Eiver. 



Glauconite. In the Silurian quartzites in Glen Eyrie ; on Trout Creek ; 

 in Four-Mile Creek canon^ and on Eagle Eiver. 



Gypsum. Selenite and satinspar. At Pleasant Park, on Bear Creek ; on 

 Camp Creek, near Glen Eyrie ; at the salt-works in South Park ; at 

 the head of Eock Creek, in the Elk Mountains. At all these localities 

 it occurs amorphous, generally of white and pink colors. At the salt- 

 works there is a black variety. 



Halite. In the sulphur springs. South Park ; in the springs and marshes 

 at the salt-works in South Park. 



Hematite. Beaver Creek, near the Colorado divide; specular, Philips 

 mine ;* micaceous, good specimens, on White Eock Mountains ; on 

 Sopris Peak ; fibrous on Silver Heels Mountain and near Hamilton ; 

 argillaceotis in the mines of Elk Mountain district ; in many places in 

 South Park. 



Hornblende. (See AmpMbole.) 



Jamesonite, Capillary. At the Sweet Home mine. Mount Bross mining 

 district. 



Limonite. Earthy in Tertiary sandstones along the east range of mount- 

 ains; near the coal-exposures, twelve miles east of Colorado Springs; 

 extensive beds in South Park.* 



Labradorite. (See Feldspar.) 



Magnetite. In the granites in foot-hill range ; on Tarryall and Michigan 

 Creeks ; on Silver Heels Mountains ; at the head of Lake Creek ; at 

 Snow Mass Mountain. 



Malachite. On Mount Guyot ; at Sweet Home and Baker mines. Mount 

 Bross mining district; in the mines of Horseshoe Mountain; in mines 

 •f Elk Mountain district. 



Marcasite,* (cellular,) Philips mine. Mount Bross mining district. 



Melaconite,* from the Unknown mine of Montgomery. 



Melanterite, in concretions at the Sweet Home mine, Mount Bross min- 

 ing district. 



Mica, very abundant and of many varieties, {biolite, muscovite, and 



