352 TRANSACTIONS OF THE 



PYROXENE. 



In fine crystals, dark green, near Mud Springs, El Dorado County. 



PYROMOEPHITE— (PAosp7m<e of Lead.) 



In Nevada, in the outcrops of the Comstock lode, especiall}^ the back 

 ledges of the Ophir ground, giving green coats and crusts on the surface 

 of the quartz. 



^YB.jm.OTm^— {Magnetic P>jr lies.) 



31ariposa Covnfij, at the lona Copper Company's tunnel, north side of 

 the Merced Eiver, on the trail from Bear Yulley to Coulterville. 



QUARTZ. 



This abundant mineral is obtained in fine crystals in the quartz veins 

 in various parts of the State, and in the mines of Washoe. Some large 

 and well formed crystals, from three to four inches or more in diameter, 

 have been found at Red Hill, in FJaecr County, (cabinet of C. W. Smith, 

 Grass Valle^',) and in the placer claims in the vieinit}^ of Placerville, 

 where also a fine large crystal of smok}^ quartz was found. Mari'poaa 

 Counti/, on Whitlock's and Shirloek's Creeks, in the quartz veins, in fine 

 groups of crystals; also at the Mariposa Mine, and in the eastern parts 

 of the Princeton vein. Calaveras Cuunf//, at the Noble claim, on Domingo 

 Creek. Nevada Count)/, in the Grass Valley mines, often supporting gold 

 between the crystals, and at the "French lode," (Eureka?) crj'stals of a 

 liirht irreenish tin";e, like that of datholite. 



RED OXYD OF COPPER. 



Occurs sparingly in thin crusts and sheets with the surfiice ores of the 

 principal copper mines in Calaveras Counti/, especially the Union and the 

 Ive3-8tone. In Mariposa County, at La Victoire Mine, with green and 

 blue carbonates of copper. l)el' Norte County, at the Evoca, Alta, and 

 other mines, in very good cabinet specimens, the cavities being lined 

 with crj'stals. In Plumas County, and in the upper parts of most of the 

 copper veins of the State. Arizona, at the Arizona Copper Mining Com- 

 pany's claim, near the Gila River, in large masses, with native copper 

 and thin crusts of green carbonate. At the claim known as No. 15, 

 Yavapais District, with native copper. 



RUBY SlJjYEU—^Pf/rarrjyrite.) 



This beautiful ore of silver was first observed in the Daney Jline, 

 AVashoe, li}- the writer, in eighteen hundred and sixty-one, and has since 

 been found sparingh- in the Ophir and the Gould and Curry. In the 

 latter mine some vcrj- fine specimens were obtained hy Mr. Strong, and 

 are de])osited in the cabinet of the company, at the office in A'ii-ginia 

 City. This ore is abundant in the veins about Austin, Reese River, and 

 is often so thoroughly spread through the quartz of the gangue as to 

 give it a decided reddish color. It is generall}- associated with sulphurct 

 of silver. No good crystals have yet been found. 



