STATE AGRICULTURAL SOCIETY. 853 



SALT— EOCK SALT. 



Abundant in the dry season, as an incrustation, tbrongliont California. 

 Found in large quantities in Nevada, in the beds of de.ssieated lakes at 

 numerous places. About twelve miles north of Armagosa Mine, in large 

 masses. In the Wasatch Mountains, southeast of Lake Tim]ianogos, on 

 the headwaters of a small creek tributary to Utah Lake, in thick strata 

 of red clay. (Fremont's Geog. Mem., 67.) This is said to be the same 

 locality mentioned by Father Esealante, in his journal, and noted by 

 Humboldt on his map as '■'■ Montagnesi de Sd Gemme." Salt cr^^stallizes 

 from the spray of the waters of the Great Salt Lake, and is found abun- 

 dantly on its shores, and on twigs and shrubs. The Great Salt Lake is 

 a saturated solution of common salt. The shores in the dry season are 

 incrusted with salt, and shallow arms of the lake present beds of salt 

 for miles. Plants and shrubs are incrusted to a thickness of an inch or 

 more with crystallized salt deposited by the spray. Five gallons of the 

 water taken in the month of September, and evaporated bj' Colonel Fre- 

 mont over a fire, gave fourteen pints of salt, which analj'sis showed, to 

 have the following proportions (^Fremont' s Memoir, d) : 



Chloride of sodium 97. SO 



Chloride of calcium 0.61 



* Chloride of magnesium 0.24 



Suljjhate of soda 0.2.3 



Sulphate of lime 1.12 



100.00 



SCHORL. 



(See Tourmaline.) 



SELENITE. 



In beautiful stellar crystallizations on the crossing of the Little Truckee, 

 Ilenness Pass road. The blades composing these aggregates are from 

 half an inch to two inches in length, and from one eighth to one quarter 

 of an inch in width. They are perfectly clear, and most of them hemi- 

 troped so as to form arrow-headed cr^^stals. (Cabinet of C. W. Smith.), 



SELENID OF MEECURY. 



In large masses from the vicinity of Clear Lake. 



SILYER— NATIVE. 



This metal, in its native state, is rare in the State of California. At 

 Silver Mountain District, (Ibrmerl}- El Dorado Counf//,) it occurs in the 

 dccom])otscd surface ores. Lou ArKjdes Connfij, in the decom])Osed parts of 

 the Maris vein, Soledad, covering surfaces of syqnite. Sonora, at the 

 celebrated Pkvn-hay. do. la Plata, just south of the Arizona line, and near 

 the meridian of Tubac. According to the best Mexican and Jesuit 

 authorities, large masses of native silver were discovered tliere in seven- 

 teen hundred and sixty-nine. One mass is reported to have weighed 

 three thousand six hundred pounds. No vein has been found; the depo- 



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