140 REPOET UNITED STATES GEOLOGICAL SURVEY. 



lenohedra in the Elk Mountain district ; fibrous in Trout Creek Park; 

 on Frying-pan Creek. Brown, rose colored, yellow, and white on 

 Table Mountain at Golden ; scaleuohedra and combinations of rhom- 

 bohedra in quartz geodes near Ouray. 



Marble. — Marble occurs at several localities in Colorado. North of 

 the Gunnison near Taylor Eiver Park is perhaps the most ex- 

 tensive deposit. 



Caledonite. — Preeland Mine, Trail Creek. 



Caolinite. — Camp near Mount Princeton. The white, chalk-like bluffs 

 on Chalk Creek near Mount Princeton owe their appearance to the 

 presence of caolinite. There it is the product of decomx^osed oligo- 

 clase. 



Carnallite. — Salt-w^orks, South Park. 



Carnelian. — See Quartz. 



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

 quantities in the Wade Hampton Mine, Argentine, Caribou. Small 

 specimens were obtained from the Ked Cloud Mine, Gold Hill. At 

 the Eosita mines. Eeported from Upper Animas region. 



Cerussite. — J. P. Whitney Mine; in very small crystals, Central ; No- 

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

 in the Hardscrabble district. Freeland Mine, Trail Creek. In the 

 Horseshoe Mine it occurs earthy, and is found throughout the mines 

 of Elk Mountain district. Caiion City. Found also in the Prospector 

 lode, Arastra Gulch, near Silverton. 



Chabazite. — Golden, Colo., Table Mountain. In basaltic geodes near 

 Uncompahgre Peak. 



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

 on several dumps near Central, in this case an eiugene species of 

 chalcopyrite. 



Chalcedony. — See Quartz. 



Chalcocite. — Bergen district, near Idaho City. Liberty lode. Bear 

 Creek, Caiion City. At the Eosita mines. 



Chalcopyrite. — Malachite and Pocahontas lodes, Bear Creek. Aurif- 

 erous in the Bobtail, Winnebago, Dallas, Gunnell, Eunning, Kansas, 

 Alps, California, and other mines at or hear Central ; mostly it occurs 

 compact, intimately associated with pyrite. It is found in every pay- 

 ing gold mine of Gilpin County, and the miners seem to think a great 

 portion of the " pay" dependent 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. In the Trinidad 

 gold-mining district, near Culebra Peak ; in the gold and silver mines 

 of Fair Play and the Elk Mountain district ; on the Dolores Eiver 

 near Mount Wilson. 



Chloanthite. — Arkansas Eiver. 



Chlorite. — On Mount Princeton ; on Trail Creek; on So<pris Peak. At 

 some localities chlorite replaces the mica either in granite or schists. 

 Mostly, the mineral occurs only in very thin flakes without crystalline 

 faces. 



Chlorophanite. — Bergen district. 



Chromite. — Massive, Silver Hills and iTair Play. 



Chrysocolla. — Champion lode. Trail Creek, Caiion City ; Allen's cop- 

 per mine, head of San Luis Valley. 



Chrysolite. — So far as can be determined, the chrysolite associated 

 with the Fort Defiance garnets extends into Colorado. (Compare 

 Lieutenant Wheeler's Annual Eeport 1875, Vol. iii., p. 105.) 



Chrysoprase. — See Quartz. 



