107 



■ Sulphide of silver and iron. 3569, Owyhee County, Idaho ; Sternbergite. 

 with copper pyrites in white quartz. 



Silver antimonide (see page 46). Specimens from the Hartz Dycrasite. 

 and from Cornwall. 



Sulph-antimonide of silver (see pa-ge 46). 8633, Bull Hill, stephanite. 

 Colorado ; massive variety. 



431, Preiberg, Saxony ; crystals on quartz. 



Sulph-antimonide of silver. 410-412, Zacatecas, Mexico ; pyrargyrite. 

 quartz richly coloured with pyrargyrite. 377, Chili ; massive 

 variety, with copper-pyrites and quartz. 



8148, Cottonwood, Utah ; in quartz. 



426-428, Andreasberg, the Hartz. Arsenic silver. 



Sulph-arsenide of silver. 413, Zacatecas, Mexico ; in quartz. Proustite. 

 384, 385, Chili ; massive. 



Sulphide of silver, copper, antimony, and arsenic ; a black Polybasite. 

 mineral, containing about 70 per cent, of metallic silver, and, 

 therefore, a valuable ore. 383, Mexico. 



Sulph-antimonide of silver. 433, 434, Hiedelencia, Spain ; Freieslebenite 

 good crystals. 



Bismuth-silver. 441, Schapbach. Schapbachite. 



A number of typical galena and other ores of silver from silver ores. 

 Colorado, Arizona, Missouri, Idaho, Utah, Washington, and United States, 

 other American localities. 



3869, Leeds, Utah ; a silver-bearing sandstone, with plant 

 remains. In geological age, and, to some extent, in general 

 appearance, this resembles the Hawkesbury sandstone of the 

 Sydney District. 



2040, Great Comstock Lode, Nevada ; quartz from the great 

 depth of 3,250 feet.* 



Galena ores from Great Britain. Europe. 



A series of ores from the Silver Spur Mine, Texas. Queensland. 



* The workings on the Comstock Lode were carried to such a depth tliat the internal 

 heat of the Earth's Crust became almost unendurable. 



