738 BULLETIN UNITED 'STATES GEOLOGICAL SURVEY. 



Mysorin. Very sparingly in the La Libertad Mine at San Antonio. The 

 quantity of material at hand for thorough determination was scarcely 

 sufficient. The analysis, however, nearly corresponds with composi- 

 tion as given by Thompson (quoted by Dana, p. 715); likewise the 

 -absence of water. Differs from malachite in color and hardness, 

 being more of reddish or brownish green, and somewhat softer. In 

 taking the general imperfect result, it is safe to say that it approaches 

 mysorin nearer than any other known compound. 



WatroUte. Locality unknown.* 



Nitre. Silver Peak. (Dana.) 



Obsidian. See Silica. 



Orlhoclasc. In fine blue and flesh-colored crystal in Fish Lake Yalley ; 

 also at Palmetto and Gold Mountain. In small crystals in the Black 

 Caiion. 



Phlogopite. In the mountains between Silver Peak and Alida District, 

 near the trail. Small specimens were obtained south of the mining 

 camp at Montezuma. 



Folyhasite. Eeese Eiver District and at Morey. 



Psilomelane, At Austin, and in less quantity at Morey. 



Proustite. Eeese Eiver District. Sparingly at Morey. 



Fijrargyrite. Massive, and in small crystals at Austin. 



Pyrite. In cubes with tetrahedryte in Galena District. In quartz, with 

 galenite at Cope, Belmont, and Morey. 



Pyrolusite. Occurs with other manganese ores at Eeese Eiver Mines 

 and at Morey. 



Pyromorphite. Found sparingly in Bull Eun, Eailroad, and Gold Mount- 

 ain Districts. 



•Quartz. See Silica. 



Ehodocrosite. Massive and crystallized at Morey; less common at 

 Austin. 



Salt. See Halite. 



Sanidin. Occurs in rhyolite from Carlin southward to Eureka ; at Bill 

 Williams's Mountain, Arizona, it occurs in beautiful, moderately sized 

 crystals in trachyte. 



Scheelite. Sparingly, with hlibnerite, in the White Mountains ; has 

 also been observed in minute crystals from Austin. 



Scolecite. Locality unknown (Foote, MS.). Story County (Dana). 



Selenite. Small crystals in clusters and aggregations at Mineral Hill, 

 Eureka, Montezuma, and San Antonio. Sparingly, in crystals half 

 an inch in length, at Belmont. Fine large crystals from Death Valley, 

 especially that portion near the Old Spanish Trail. 



Selen sulphur. Occurs sparingly at Mount Diablo. A specimen of kali- 

 nite half an inch through was coated with a semi-crystalline layer of 

 sulphur on one side, and with a layer of dark orange colored selen- 

 'sulphur on the other. 



* Dr. A. E. Foote, in a private communication. 



