HOFFMAN ON THE MINERALOGY OF NEVADA. 739 



Serpentine. Eight miles west of Palmetto Cauon; also iu Darwin Caiion. 



Siderite. At Bull Eun, in small ■ crystals. Poor specimens were 

 obtained iu the White Mountains. 



Silica, a. Crystallized, at Tuscarora, where it frequently occurs in 

 geodes, at San Antonio and Belmont. Crystals with double termina- 

 tions at Gold Mountain. Small green crystals at Eeese River, San 

 Antonio. 



b. Rose quartz, at Tuscarora, Morer, Carlin, and Silver Peak. 



c. Citron stone, at Tuscarora, Gold Mountain, and in Palmetto 

 CaSon. 



d. Agate, abundant at Tuscarora, San Antonio, in Fish Spring Val- 

 ley, and on the mesa west of the mouth of Rio Virgen. 



e. Chalcedony, at Tuscarora, San Antonio, Eureka, and Virgen River 

 mesa. 



/. Amethyst, in small crystals, in geodes, at Tuscarora. 



g. Opal, in magnificent colors, with silicified wood. In breaking 

 some of the large trunks at San Antonio, fine specimens were 

 obtained ; occurs also at Tuscarora. 



h. Carnelian, in pebbles and lumps (averaging about the size of a 

 common walnut), of all shades, from a pure white to dark reddish- 

 brown, on the Virgen River mesa. 



i. Onyx, occasionally found in the same locality. 



j. Sardonyx, same as the last. 



h. Aventurine quartz, found on the mountain-slope east of Fish 

 Spring Valley. 



I. Millcy quartz, on the Virgen River mesa, though very seldom. 



m. Prase, on the mountains near Silver Peak miiling-camp, rarely. 



n. Silicified icood, at Tuscarora. Very fine at San Antonio. 



0. Jasper, at Deep Spring Valley, near Silver Peak, and along the 

 western border of the Virgen River mesa 5 usually of dull yellow 

 or nd colors. Better specimens at Gold Mountain. Abundant on 

 the desert east of Lone Mountain. 



p. Flint (hornstone), in the limestone south of Eureka; also east of 

 Lone Mountain. 



q. Obsidian, iu fine pieces and very abundant ten miles southeast 

 of Silver Peak. Across the State line (five miles), in Owens Valley, 

 it occurs iu red fragments, also banded with alternate layers of 

 black and brown. 

 Silver. In small foliated masses at Bull Run; Eureka; at Belmont it 

 sometimes occurs in fine reticulated forms. In delicate fibers in 

 Galena District. 

 Silicified. wood. See Silica. 

 Stembergite. Reese River. (Loew\) 

 Stephanite. In small crystals at Reese River and at Belmont. Occurs 



also in other regions. 

 Stetefeldtite. Sparingly at Mineral Hill, Hyko, and Eureka. 



