PEALE.] GEOLOGY CATALOGUE OF MINERALS. 267 



. i^o. 1.— CATALOGUE OF MmEEALS. 



This catalogue includes ouly the minerals found in the South Park 



district. I am indebted to Mr. Peters, of Fair Play, for those marked 



with an asterisk. The complete catalogue will be found appended to 



Dr. Endlich's report. 



Actinolite. (See AmpMhole.) 



Agate. (See Quartz.) 



Alabaudite*. Massive in some of the old gold-mines near Quartzville. 



Amethyst. (See Quartz.) 



Amphibole. Actinolite on Sopris Peak; hornblende on Sopris Peak; 

 in schistose rocks near Montgomery ; in trachytes of Buffalo Peak and 

 the south end of South Park. 



Anglesite. Small crystals in the lead- mines of Horseshoe Mountain. 



Anhydrite.* (Crystallized.) At the salt-works in South Park. 



Aj^atite.* (Massive.) In schists near Mount Lincoln. 



Argentite.* (Amorphous and laminated.) In the Silver Star, Moose, 

 and other mines of Mount Bross. 



Arsenopyrite.* (Massive.) In Priest Mine, Mount Bross. 



Azurite. Crater Mountain. In mines near Fair Play ; in mines in Elk 

 Mountain district. 



Barite. In all the silver-mines about Fair Play forming the principal 

 gangue. It is both massive and crystallized ; at Homestake Mine near 

 Tennessee Pass. 



Basanite. (See Quartz.) 



Biotite. (See Mica.) 



Calcite. Abundant in all the limestones throughout the district; yellow 

 crystals near Cheyenne Mountain ; red crystals on Mount Bross.; rhomb 

 spar at Sulphur Springs in South Park ; fibrous at the head of Trout 

 Creek, near South Park. 



Carnallite.* [Crystallized.) At salt-works in South Park. 



Cerargyrite.* (Massive.) In small quantity in the Wade Hampton 

 mine. The Moose and other mines in the limestones of Mount Bross 

 carry from 5 to 20 per cent, of their contents in the shape of chloride 

 invisible to the eye. 



Cerrussite. In the mines in the Elk Mountain district near the head of 

 Rock Creek ; in the mines of Horseshoe Mountain, where it occurs 

 abundantly; at Homestake Mine, near Tennessee Pas3. 



Chalcedony. (See Quartz.) 



Chalcopyrite. In the mines of the Elk Mountain district. It is found 

 also in all the gold and most of the silver mines near Fair Play. It 

 is the richest matrix for gold, and often assays $150 per ton, and also 

 $300 in silver. It is crystallized and massive, and often iridescent ;* 

 at Homestake Mine, Tennessee Pass. 



Chlorite. (See Bipidolite.) 



Chromite.* (Massive.) On Silver-Heels Mountain. 



Coal. At Gehrung's Mine on Monument Creek; twelve miles east of 

 Colerado Springs, northeast of Fair Play; in Elk Mountains, good 

 quality. 



Cuprite. In minute crystals in Sacramento Gulch and in the Sw^et- 

 Home Mine. 



Dolomite. (Massive.) In limestones in canon of Four-Mile Creek. 



Epidote. Very abundant in the schists in the foot-hill range ; on the 

 summit of Mount Bross ; in Lake Creek Canon ; on Massive Mount- 

 ain ; at the head of Eock Creek ; at the Elk Mountain mines. 



