SILVER. 



SII.VKI:. 



(1) (2) 



Sulphur 15 11-96 



SUver 85 



_100 100 



Blael Sulphuret of Silver; Earthly Silver Glance. Derived from 

 the decomposition of the last-mentioned. Occurs massive and pul- 

 verulent Fracture uneven. Colour dark-lead gray, inclining to black. 

 Devoid of lustre, or only feebly glimmering. Somewhat sectile. 

 Streak shining, metallic. It is found in Norway, Siberia, Hungary, 

 4c., usually investing other silver-ores or filling up cavities in them. 



SulfJiuret of Silver and Anenie; Light Red Silver; Prouttitt. 

 Primary form a rhomboid. Colour cochineal to aurora red ; streak 

 lighter. Lustre adamantine. Translucent to transparent. Specific 

 gravity 5-5 to 5-6. 



It is found at Joachimsthal, Jobanngeorgenstadt, Annaberg, &c. 

 Rose's analysis (1) and Proust's (2) give the following as the 

 composition of a specimen from Joachimsthal : 



(I) (2) 



Sulphur . . . 19-51 Sulphuret of Silver 74-35 



SUver . . . 64-67 Sulphuret of Arsenic 25 



Arsenic . . . 15-09 

 Antimony . . 00-69 M U 



99-96 



Sulpkurel of Silver and Antimony ; Ruby Silver; Dark Red Silver; 

 Braardite. Occurs crystallised and massive. Primary form a rhomboid. 

 Cleavage parallel to the primary planes, usually indistinct Fracture 

 conchoidal Colour, by reflected light, from lead-gray to iron-black ; 

 by transmitted light, from brilliant to dark-red. Lustre adamantine. 

 Translucent Opaque. Hardness 2*0 to 2'5. Extremely brittle. 

 Streak red. Specific gravity 5-8 to 5-9. 



M attire Varieties. Structure granular, compact, lamellar, dendritic, 

 amorphous. It is found in many parts of Europe and America, as 

 Germany, Norway, Mexico, and Peru, and also in Cornwall. 



According to Bonsdorff, a specimen from Andreasberg yielded by 

 analysis 



Sulphur 16-609 



SUver 58-949 



Antimony 22-846 



98-404 



Sulphuret of Silver and Antimony; Miargyrite. Occurs crystallised. 

 Primary form an oblique rhombic prism. Cleavage imperfect Fracture 

 uneven. Colour iron-block in mass ; but in thin fragments deep-red 

 by transmitted light Nearly opaque. Lustra bright metallic. Hard- 

 ness 2-0 to 2-5. Very sectile. Streak dark-red. Surfaces of the 

 crystsls usually striated. Specific gravity 5 -2 to 5*4. 



It is found with argentiferous arsenical pyrites at Braunsdorft, near 

 Freiberg, Saxony. According to Rose, it yielded 



Sulphur 21-95 



Silver 36-40 



Antimony 39-14 



Copper 1-06 



Iron 0-62 



99-17 



Sulphuret of Silver and a little Iron; Biegiamer Silberglanz. 

 Occurs crystalline and massive. Crystals small and tabular. Cleavage 

 parallel to the terminal planes. Colour nearly black. Lustre metallic. 

 Very soft. ReadUy separable into thin flexible lamina;. It is found 

 only in Hungary and at Freiberg. 



According to Wollaston, this mineral (which is extremely rare) 

 consists of sulphuret of silver with a little iron. 



Sulpkuret of Silver and Iron; Stembergite; Flexible Sulphuret of 

 Sitter. Occurs crystallised. Primary form a right rhombic prism. 

 Cleavage parallel to the terminal plane, distinct Lamina very 

 flexible. Colour dork-brown, often with a blue tarnish. Streak black. 

 Lustre metallic. Hardness I'O to 1*5. Specific gravity 4-2 to 4-25. 



It is found at Johanngeorgenatadt, Schneeberg, and Joachimsthal 

 in Bohemia, with other silver ores. 



A specimen from the last-mentioned locality yielded, according to 

 the analysis of Zippe 



Sulphur 30 



Silver 33'2 



Iron 86 



99-8 



Brittle Sulphuret of fiUrtr, Antimony, and Iron; Brittle Silver 

 Wain*. Occurs crystallised. Primary form a right rhombic prism. 

 Crystals commonly macled. Fracture unually conchoidal, with a 

 shining metallic lustre. Colour dark-gray or iron-gray. Hardness 

 8-0 to 3. Specific gravity 6-9 to 6-4. 



It is found in Saxony, Bohemia, Hungary, Siberia, and Mexico. 

 Analysis of a specimen from Freiberg by 



Kl.proth. Bess, 



Sulphur 12 16-42 



Silver tifl-6 68-54 



Antimony 10 14-68 



Iron 5 0-00 



Copper 0-5 0-64 



OS-5 100-28 



Sulphurrt of Silttr and Copper; Silberkupfcrghuu. Occurs massive. 

 Compact Fracture brilliant, granular, flat conchoidal. Colour dark 

 lead-gray. Streak shining. Lustre metallic. Opaque. Soft Specific 

 gravity 6-25. It is found at Schlangenberg, near Colivan in Siberia. 



Its analysis by Stromeyer gives 



sulphur ' . 15-96 



Silver 62-87 



Copper 30-83 



Iron 00-34 



100 



Sulphvretof Silver, Antimony, and Copper; Romelite; Mineif Argent 

 ffrite Antimoniale, It occurs crystallised. Primary form a right 

 rhombic prism. Cleavage parallel to the lateral planes. Colour 

 nearly silver-white. Lustre shining, metallic. Opaque. Hardness 

 2-0 to 2*5. Extremely brittle. Specific gravity 5*5 to 5*6. 



It consists principally of sulphur and the metals above named, but 

 in proportions not yet determined. 



Sulphuret of Silver, Artenic, Antimony, and Copper; Polybatite; 

 Brittle Silver. It occurs crystallised. Primary form a right rhombic 

 prism. Cleavage imperfect Fracture uneven. Colour iron-black. 

 Lustre metallic. Translucent Opaque. Hardness 2-0 to 2*5. Specific 

 gravity 6-269. 



It is found in Bohemia, Saxony, and other parts of Europe ; and in 

 Mexico and Peru. 



Analysis of a specimen from Mexico (1) by Rose, and from Freiberg 

 (2) by Brandos : 



(1) (2) 



Sulphur 1704 19-40 



Silver 64-29 6WO 



Arsenic . . . . . 3-74 3-30 



Antimony .... 5-09 " "" 



Copper 9-93 3-75 



Iron 0-06 Kfl 



100-15 97-41 



Sulfihunt of Silver, Iron, Copper, BitmtUh, and Lead; Bitmuthic 

 Silver. It occurs in acicular crystals and massive. Fracture uneven. 

 Colour, when first broken, lead-gray, but liable to tarnish. 



M outre. Varietiet disseminated, amorphous. Fracture fine-grained , 

 uneven. Lustre metallic. Opaque. Soft Sectile and brittle. 



It is found accompanying pyrites and galena at Schnappach in the 

 valley of Kinzig, Baden. 

 Analysis by Klnproth : 



Sulphur 16-3 



SUver 15.0 



Iron 4-3 



Copper 0-9 



Bismuth 27-0 



Lead 33-0 



96-5 



SeUniuret of Silver; Selentilver. Occurs crystallised. Primary form 

 a cube. Occurs in thin plates. Hardness between gypsum and 

 calcspar. Flexible. Specific gravity 80. Colour iron-black; streak 

 the same, but brighter. It is found at Tilkerode in the Hartz, associated 

 with seleuiuret of lead. 

 Analysis by O. Rose : 



Selenium ....... 24-05 



Silver 65'56 



Seloniuret of Lead, with a little Iron . . 679 



96-40 



Seleniuret of SUver and Copper; SuJcairite. It occurs massive. 

 Structure granular. Colour gray. Lustre shining. Disposed in films 

 on calcareous spar. It is found in a copper-mine at Skrickernm in 

 Smaland, Sweden. 



Its analysis by Berzelius gives 



Selenium 26 



SUver 38-93 



Copper 23.05 ' 



Earthy matter 8-90 



Carbouic Acid and loss 3'12 



100 



Carbonate of SUver and Antimony ; Sdbile. It occurs massive and 

 disseminated. Fracture uneven. Colour grayish-black. Structure 

 fine granular. Lustre metallic. Opaque. Soft. Brittle. Heavy. It 

 is found at Altwolfach in the Black Forest 

 lt analysis by Selb gives 



Carbouic Acid . 12 



Silver 72-6 



Oxide of Antimony and a trace of Copper . 15-5 



100-1 



This analysis cannot however be correct, if the ore contain carbonate 

 of silver. 



Ar$eniate of Silver and Iron; Oanekothiy-erz ; Gootedung Silver-Ore. 

 It occurs massive. Mammillated. Fracture conchoidal ; sometimun 

 earthy, and mixed with cobalt-ore. Colour yellow or pale-green. 

 Streak white. Lustre resinous. It is found chiefly in the mines of 

 Clausthal in the Hartz ; and also in Cornwall, and at Allemont in 

 France. It does not appear to have been accurately analysed. 



