734 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Cassiterite. The only locality where stream tin was found to occur is 

 at the Tuscarora placer mines. Small crystals are occasionally met 

 with. 



Cerargyrite. Frequently met with in the Comstock Mine; rarely at 

 Montezuma ; in small pale brown and greenish-brown crystals at San 

 Antonio 5 in fine cinnamon-brown crystals at Belmont, Philadelphia 

 Mine; also sparingly at Bull Kun; more frequent at Pioche, Eeese 

 Kiver District, White Pine District, and at Columbus. 



Cerussite. In drusic incrustations on galenite at Bull Eun ; massive, of 

 dirty-white and yellowish-gray colors, in Pinto District. Occurs in 

 elongated six-rayed crystals at Hyko. Associated with and coating 

 clusters of crystals of anglesite at Eureka. 



Cervantite. Massive and in minute crystallized coatings, sparingly, 

 with stibnite, west of Battle Mountain. 



Chalcedony. See Silica. 



Cluibazite. In small but fine crystals in La Libertad Mine, San Antonio 

 District. Many of these crystals were coated with smaller crystals of 

 cerargyrite. 



Chalcocite. Common at Eeese Eiver District. It is said to occur with 

 the sulphuret ores throughout the State, but the specimens received 

 from various contributors were not labeled. Professor Dana mentions 

 it as occurring in Washoe, Humboldt, Churchill, and Nye Counties.* 



Chalcopyrite. Massive in Galena District ; associated with pyrite and 

 galenite in Eailroad District. 



Clialcofricliite. Sparingly in Galena District, with the ordinary crystals 

 of cuprite, of which it is a variety. 



Chrysolite. Specimens said to be from this State in Captain Babbitt's 

 collection at Palisade ; locality unknown. Dr. A. E. Foote informs 

 me likewise of its occurrence in I^Tevada. 



Cinnabar. Massive, occasionally in minute acicular coatings, at Steam- 

 boat Springs. (Partz.) 



Citron stone. See Silica. 



Coal. See Appendix A. 



Copper. Occurs in thin, arborescent leaves or sheets at Bull Eun, Bat- 

 tle Mountain District ; sparingly at Eureka and Belmont. More fre- 

 quent at Galena District, where crystals of cuprite have been obtained 

 containing minute filaments of native copper. 



Corundum. Impure columnar fragments, sometimes nearly an inch in 

 diameter, at Silver Peak. 



Cuprite. In cubes, sometimes measuring .5 of an inch across, having 

 truncated edges ', twin crystals, tabular, at Galena District ; frequent 

 occurrence of fibers of native copper protruding from one or more 

 faces of a crystal. * 



Datolite. In small crystals at Montezuma, Silver Peak, and Gold 

 Mountain. 



"System of Mineralogy, etc., J. D. Daaa, New York, 1868, p. 53. 



