BNDUCH.] CATALOGUE OF COLOKADO MINERALS. 151 



SCHIRMEEITE (Genth). — With tellurides at the Eed Cloud Mine, Gold 

 Hill. An analysis by Professor Genth furnished :* 



(1) (2) 



Per cent. Per cent. 



Pb 12.69 12.76 



Ag 22.82 24.75 



Bi 46.91 47.27 



Zn 0.08 0.13 



Fe 0.03 0.07 



S 14.41 15.02 



96.94 100.00 



ScnREiBERSiTE. — In the Colorado meteorite. 



Selenite. — See Gypsum. 



Semiopal. — See Opal. 



Serpentine. — Small specimens of serpentine occur in the metamorphic 

 rocks of Mosco Pass. 



SiDERiTE. — Crystallized in South Park, Gold Hill, Colo.; Veto lode, 

 Gibson Gulch ; Eob Roy lode, Central City. At the Rosita mines. 



Silver. — Native, as wire-silver, at the Terrible, Georgetown ; at the 

 International, on Mount McClellan ; as wire-silver in the No-Name 

 and Caribou mines, at Caribou. In small nuggets and thin scales 

 near Fair Play in Washington Gulch, Homestake lode; Sunshine; 

 Gold Hill; Blue River, Montezuma; Jones Mountain and Mount 

 Sneff'els, San Juan. 



Sinter calcareous. — /8'ee Tufa. 



Sinter-siliceous. — See Quartz. 



Smithsonite. — Jones's Mine on sphalerite, near Central, Running lode, 

 Black Hawk. 



Soda. — Carbonate, from the Hot Springs. 



Sodium-chloride. — See Halite. 



Soda- SULPHATE.— iSee Glauber-salt. 



Spessartite. — See Garnet. 



Sphalerite. — Occurs in almost every mine; only few exceptions take 

 place. In the lead-silver mines it is more abundant than in the gold 

 mines. It is found in the Winnebago, dark brown, Dallas, Gunnell, 

 J. P. Whitney, Kansas, Wood, California, Running, Bobtail, Briggs 

 (small quantities in these two), Monte Cristo, and numerous other 

 mines in the vicinity of Central. The mines of Georgetown invari- 

 ably contain it. The Caribou mint'-s show at times large quantities of 

 the mineral. Mount Princeton : sphalerite, containing cadmium, found 

 in several mines near Fair Play. Occurs in nearly all the mines of 

 the San Juan region. Varies in color from greenish yellow to brown 

 and black. Brilliant crystals are found in the Terrible lode at George- 

 town. 



Spinel. — Crystal Mine, Virginia Canon. 



Staurolite. — Simple and twin crystals in the micaceous schists near 

 Mount Oso, Quartzite Mountains. 



Sternbergite (iron and silver sulphide). — Georgetown. (Loew.) 



Stephanite. — Colorado Central, Georgetown, Moose Mine, near Fair 

 Play, Montezuma, and other localities. 



Stibnite. — Terrible Mine, near Georgetown, Boulder County. 



Stilbite. — Very fine crystals in cavities of basalt, near Uncompahgre 

 Peak. 



*Proc. Phii. Soc. Phila., xiv, p. 230. 



