:E2a)LicH.l GEOLOGY — MINERALOGICAL CATALOGUE. 357 



S. Rhombohedral crystals on Cheyenne Mountain ; in the limestones 

 of South Park; scalenohedra in Elk Mountain district; fibrous in 

 Trout Creek Park ; on Fryiug-Pan Creek, P. 

 Caledonitb. — Freeland mine. Trail Creek, S. 

 Caolinite. — Camp 42, E. 

 Carnallite. — Salt-works, South Park, Peters. 

 Carneliajst. — Middle and South Parks, M. Los Pinos agency, E. 

 Cerargyrite. — Gilpin County lode, Black Hawk, S. Small, compact 



quantities in the Wade Hampton mine, Peters. 

 Cerrussite. — J. P. Whitney mine, in very small crystals; Central; 

 ifo Name, Caribou ; Caribou mine ; Silver Hills mines and Eosita 

 mines in the Hardscrabble district, E. Freeland. mine, Trail Creek, S. 

 In the Horseshoe mine it occurs earthy, and is found throughout the 

 mines of Elk Mountain district, P. 

 Chalcedony. — On station 27 ; at the Los Pinos agency, E. Middle 

 and. South Parks, M. and P. Buffalo Park ; Fair Play ; Frying Pan ; 

 Trout Creek, &c., P. 

 Chalcanthite. — On Clear Creek below Black Hawk, in a deposit, and 



on several dumps near Central, E. 

 Chalcocitb. — Bergen district, near Idaho City, F. Liberty lode, 



Bear Creek, S. • 



CHALCOPYTiiTE. — Auriferous in the Bobtail, Winnebago, Dallas, Gun- 

 nell, Running, Kansas, California, and, other mines at and near Cen- 

 tral ; mostly occurring compact, and frequently very intimately inter- 

 mixed with pyrite. It occurs in every paying gold-mine in Gilpin 

 County, and the miners seem to think a great part of the " pay" de- 

 pendent upon its presence. It also occurs in the Terrible, Pelican, 

 Cold Stream, and other mines of Georgetown, as well as in those of 

 Caribou and Hardscrabble, E. In the gold and silver mines of Fair 

 Play and the Elk Mountain District, P. 

 Chlorite. — On station 45, E. On Trail Creek, S. On Sopris Peak, P. 

 Chlorophanite. — Bergen district, S. 

 Chromite. — Massive ; Silver Hills and Fair Play, Peters. 

 Chrysocolla. — Champion lode. Trail Creek, S. 

 Chrysoprase. — Ea-re, in Middle Park, S. 

 Coal. — Fid'e Bitilme^ous coal. 



Copper. — I^ative ; arborescent in the Gregory lode, Central, E. 

 CoppERASiTE. — On the dumps of the Wood Lode and Nevada, E. 

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



Home mine, Peters. 

 Dolomite. — From the Four-Mile Creek, P. • 

 E]\iBOLiTE.— Peru district, Snake Eiver, F. 



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

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

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

 massive or in small crystals, E. On the summit of Mount Bros, Lake 

 Creek Caiion, Grand Mountain, Elk Mountain Eidge, and all through 

 the foot-hills, P. On Trail Creek, S. 

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

 Georgetown ; No name. Caribou, and others at Caribou ; station 46, E. 

 For particulars see chapter 1. 

 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 station 46, 

 at Eosita, E. Twins are also found in the porphyries of Gold Hill, 

 M., on Elk Creek ; and at Idaho, S. Compare Orthoclase. 



